7,000,000 Shares SIRENZA MICRODEVICES, INC. Common Stock, par value $0.001 per share PURCHASE AGREEMENT

Exhibit 1.1

EXECUTION COPY

7,000,000 Shares

SIRENZA MICRODEVICES, INC.

Common Stock, par value $0.001 per share

PURCHASE AGREEMENT

February 15, 2007

PIPER JAFFRAY & CO.

U.S. Bancorp Center

800 Nicollet Mall

Minneapolis, Minnesota 55402

Ladies and Gentlemen:

The stockholders listed in Schedule I hereto (the “Selling Stockholders”) of Sirenza Microdevices, Inc., a Delaware corporation (the “Company”), propose to sell to Piper Jaffray & Co. (the “Underwriter”) an aggregate of 7,000,000 shares (the “Securities”) of Common Stock, $0.001 par value per share (the “Common Stock”) of the Company. The Securities consist of outstanding shares of Common Stock to be sold by the Selling Stockholders. The Company and the Selling Stockholders hereby confirm their agreement with respect to the sale of the Securities to the Underwriter.

1. Registration Statement and Prospectus. The Company has prepared and filed with the Securities and Exchange Commission (the “Commission”) a registration statement on Form S-3 (File No. 333-138776) under the Securities Act of 1933, as amended (the “Securities Act”), and the rules and regulations (the “Rules and Regulations”) of the Commission thereunder, and such amendments to such registration statement as may have been required to the date of this Agreement. Such registration statement has been declared effective by the Commission. Such registration statement, at any given time, including amendments thereto to such time, the exhibits and any schedules thereto at such time, the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the Securities Act at such time and the documents and information otherwise deemed to be a part thereof or included therein by Rule 430B under the Securities Act or otherwise pursuant to the Rules and Regulations at such time, is herein called the “Registration Statement.”

The prospectus in the form in which it appears in the Registration Statement at the time such Registration Statement was declared effective is hereinafter called the “Base Prospectus.” The Company proposes to file with the Commission pursuant to Rule 424(b) under the Securities Act a final prospectus supplement that shall include the Base Prospectus as so supplemented which is hereinafter called the “Prospectus.” Any reference herein to the Base Prospectus or the Prospectus shall be deemed to include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the Securities Act as of the date of such prospectus (“Incorporated Documents”).

For purposes of this Agreement, all references to the Registration Statement, the Base Prospectus, the Prospectus or any amendment or supplement to any of the foregoing shall be deemed to include the copy filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval System (“EDGAR”). All references in this Agreement to financial statements and schedules and other information which is “described,” “contained,” “included” or “stated” in the Registration Statement, the Base Prospectus or the Prospectus (or other references of like import) shall be deemed to mean and include all such financial statements and schedules and other information which is incorporated by reference in or otherwise deemed by the Rules and Regulations to be a part of or included in the Registration Statement, the Base Prospectus or the Prospectus, as the case may be; and all references in this Agreement to amendments or supplements to the Registration Statement, the Base Prospectus or the Prospectus shall be deemed to mean and include the subsequent filing of any document under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and which is deemed to be incorporated therein by reference therein or otherwise deemed by the Rules and Regulations to be a part thereof.

2. Representations and Warranties of the Company and the Selling Stockholders.

(a) The Company represents and warrants to, and agrees with, the Underwriter as follows:

(i) No order preventing or suspending the use of the Base Prospectus has been issued by the Commission.

(ii) The Registration Statement was initially declared effective by the Commission under the Securities Act on November 30, 2006. The Company has not received any requests of the Commission for additional or supplemental information with respect to the Registration Statement. No stop order suspending the effectiveness of the Registration Statement is in effect and no proceedings for such purpose have been instituted or are pending or, to the best knowledge of the Company, are threatened by the Commission.

(iii) Each part of the Registration Statement and any post-effective amendment thereto, at the time such part became effective (including each deemed effective date with respect to the Underwriter pursuant to Rule 430B under the Securities Act), at all other subsequent times until the expiration of the Prospectus Delivery Period (as defined below), and at the Closing Date (as hereinafter defined), and the Prospectus (or any amendment or supplement to the Prospectus), at the time of filing or the time of first use within the meaning of the Rules and Regulations, at all subsequent times until expiration of the Prospectus Delivery Period, and at the Closing Date complied and will comply in all material respects with the applicable requirements and provisions of the Securities Act, the Rules and Regulations and did not and will not contain any untrue statement of a material

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fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. The Prospectus, as amended or supplemented, as of its date, or the time of first use within the meaning of the Rules and Regulations, at all subsequent times until the expiration of the Prospectus Delivery Period, and at the Closing Date, did not and will not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The representations and warranties set forth in the two immediately preceding sentences do not apply to statements in or omissions from the Registration Statement or any post-effective amendment thereto, or the Prospectus, or any amendments or supplements thereto, made in reliance upon and in conformity with written information relating to an Underwriter furnished to the Company by you specifically for use in the preparation thereof.

(iv) The Issuer Free Writing Prospectus(es) set forth on Schedule II issued at or prior to the Time of Sale and the Base Prospectus and the Incorporated Documents and the pricing information set forth on the Pricing Information Annex on Schedule III hereto, all considered together (collectively, the “Time of Sale Disclosure Package”), does not include or will not include as of the Time of Sale any untrue statement of a material fact or omit or will not omit as of the Time of Sale to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The preceding sentence does not apply to statements in or omissions from the Base Prospectus included in the Registration Statement or any Issuer Free Writing Prospectus based upon and in conformity with written information furnished to the Company by you specifically for use therein. As used in this paragraph and elsewhere in this Agreement:

(1) “Time of Sale” means 4:35 pm (Eastern time) on the date of this Agreement

(2) “Issuer Free Writing Prospectus” means any “issuer free writing prospectus,” as defined in Rule 433 under the Securities Act, relating to the Securities that (A) is required to be filed with the Commission by the Company, or (B) is exempt from filing pursuant to Rule 433(d)(5)(i) under the Securities Act because it contains a description of the Securities or of the offering that does not reflect the final terms or is a “bona fide electronic road show,” as defined in Rule 433 of the Rules and Regulations, in each case in the form filed or required to be filed with the Commission or, if not required to be filed, in the form retained in the Company’s records pursuant to Rule 433(g) under the Securities Act specified in Schedule II to this Agreement.

(v) (A) Each Issuer Free Writing Prospectus, as of its issue date and at all subsequent times through the Prospectus Delivery Period or until any earlier date that the Company notified or notifies the Underwriter as described in Section 4(a)(iii)(B), did not, does not and will not include any information that conflicted, conflicts or will conflict with the information contained in the Registration Statement or the Prospectus. The foregoing sentence does not apply to statements in or omissions from any Issuer Free Writing Prospectus based upon and in conformity with written information furnished to the Company by you specifically for use therein.

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(B)(1) At the earliest time after the filing of the Registration Statement that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) under the Securities Act) of the Securities and (2) at the date hereof, the Company was not and is not an “ineligible issuer,” as defined in Rule 405 under the Securities Act, including the Company or any subsidiary in the preceding three years not having been convicted of a felony or misdemeanor or having been made the subject of a judicial or administrative decree or order as described in Rule 405 (without taking account of any determination by the Commission pursuant to Rule 405 that it is not necessary that the Company be considered an ineligible issuer), nor an “excluded issuer” as defined in Rule 164 under the Securities Act.

(C) Each Issuer Free Writing Prospectus satisfied, as of its issue date and at all subsequent times through the Prospectus Delivery Period, all other conditions to use thereof as set forth in Rules 164 and 433 under the Securities Act.

(vi) The financial statements of the Company, together with the related notes, set forth or incorporated by reference in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus comply in all material respects with the requirements of the Securities Act and the Exchange Act and fairly present the financial condition of the Company as of the dates indicated and the results of operations and changes in cash flows for the periods therein specified in conformity with generally accepted accounting principles consistently applied throughout the periods involved; and the supporting schedules included in the Registration Statement present fairly the information required to be stated therein. No other financial statements or schedules are required to be included in the Registration Statement, the Time of Sale Disclosure Package or the Prospectus. To the Company’s knowledge, Ernst & Young LLP, which has expressed its opinions with respect to the financial statements and schedules incorporated by reference in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus and with regard to the Company’s internal control over financing reporting and management’s assessment thereof, are (A) an independent public accounting firm within the meaning of the Securities Act and the Rules and Regulations, (B) a registered public accounting firm (as defined in Section 2(a)(12) of the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”)) and (C) not in violation of the auditor independence requirements of the Sarbanes-Oxley Act. To the Company’s knowledge, PricewaterhouseCoopers LLP, which has expressed its opinions with respect to certain of the consolidated financial statements and schedules of Micro Linear Corporation and its subsidiaries (collectively, “Micro Linear”) incorporated by reference in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus, is (A) in respect of Micro Linear an independent public accounting firm within the meaning of the Securities Act and the Rules and Regulations, (B) a registered

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public accounting firm (as defined in Section 2(a)(12) of the Sarbanes-Oxley Act) and (C) in respect of Micro Linear not in violation of the auditor independence requirements of the Sarbanes-Oxley Act. To the Company’s knowledge, C.G. Uhlenberg LLP, which has expressed its opinions with respect to certain of the consolidated financial statements and schedules of Premier Devices, Inc. and its subsidiaries (collectively, “PDI”) incorporated by reference in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus, is in respect of PDI an independent auditor. The pro forma financial data included in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus present fairly the information shown therein, comply in all material respects with the requirements of the Securities Act, the Exchange Act and the Rules and Regulations with respect to pro forma financial statements, have been properly compiled on the pro forma basis described therein and the assumptions used in the preparation thereof are reasonable and the adjustments used therein are appropriate to give effect to the transactions or circumstances referred to therein. Except as disclosed in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus, there are no material off-balance sheet transactions, arrangements, obligations (including contingent obligations), or any other relationships with unconsolidated entities or other persons, that may have a material current or, to the Company’s knowledge, future effect on the Company’s financial condition, results of operations, liquidity, capital expenditures, capital resources or significant components of revenue or expenses.

(vii) Each of the Company and its “significant subsidiaries” (as such term is defined in Rule 1-02 of Regulation S-X) which subsidiaries are set forth on Schedule IV hereto (each a “Subsidiary” and, collectively, the “Subsidiaries”) has been duly organized and is validly existing as a corporation in good standing under the laws of its jurisdiction of incorporation to the extent the concept of “good standing” is applicable in such jurisdictions. Each of the Company and its Subsidiaries has full corporate power and authority to own its properties and conduct its business as currently being carried on and as described in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus, and is duly qualified to do business as a foreign corporation in good standing in each jurisdiction in which it owns or leases real property or in which the conduct of its business makes such qualification necessary and in which the failure to so qualify would have a material adverse effect upon the business, management, properties, operations, condition (financial or otherwise) or results of operations of the Company and its Subsidiaries, taken as a whole (“Material Adverse Effect”).

(viii) Except as contemplated in the Time of Sale Disclosure Package and in the Prospectus, subsequent to the respective dates as of which information is given in the Time of Sale Disclosure Package, neither the Company nor any of its Subsidiaries has incurred any material liabilities or obligations, direct or contingent, or entered into any material transactions, or declared or paid any dividends or made any distribution of any kind with respect to its capital stock; and there has not been any

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change in the capital stock (other than a change in the number of outstanding shares of Common Stock due to the issuance of shares upon the exercise of outstanding options or warrants), or any material change in the short-term or long-term debt, or any issuance of options, warrants, convertible securities or other rights to purchase the capital stock other than ordinary course of business grants of equity incentive awards under the Company’s stock plans, of the Company or any of its Subsidiaries, or any material adverse change in the, condition (financial or otherwise), business, management, properties, operations or results of operations of the Company and its Subsidiaries, taken as a whole (“Material Adverse Change”) or any development involving a prospective Material Adverse Change.

(ix) Except as set forth in the Time of Sale Disclosure Package and in the Prospectus, there is not pending or, to the knowledge of the Company, threatened, any action, suit or proceeding to which the Company or any of its Subsidiaries is a party or of which any property or assets of the Company is the subject before or by any court or governmental agency, authority or body, or any arbitrator, which, individually or in the aggregate, would be reasonably expected to result in any Material Adverse Change.

(x) There are no statutes, regulations, contracts or documents that are required to be described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus or be filed as exhibits to the Registration Statement by the Securities Act or by the Rules and Regulations that have not been so described or filed.

(xi) This Agreement has been duly authorized, executed and delivered by the Company, and constitutes a valid, legal and binding obligation of the Company, enforceable in accordance with its terms, except as rights to indemnity hereunder may be limited by federal or state securities laws and except as such enforceability may be limited by bankruptcy, insolvency, reorganization or similar laws affecting the rights of creditors generally and subject to general principles of equity. The execution, delivery and performance of this Agreement and the consummation of the transactions herein contemplated will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, any statute, any agreement or instrument to which the Company is a party or by which it is bound or to which any of its property is subject, the Company’s charter or bylaws, or any order, rule, regulation or decree of any court or governmental agency or body having jurisdiction over the Company or any of its properties except where such breach, violation or default would not be reasonably expected to result in any Material Adverse Change; no consent, approval, authorization or order of, or filing with, any court or governmental agency or body is required for the execution, delivery and performance of this Agreement or for the consummation of the transactions contemplated hereby, except where the failure to obtain consent, approval, authorization, order or filing would not be reasonably expected to result in any Material Adverse Change or such as may be required under the Securities Act or state securities or blue sky laws; and the Company has full power and authority to enter into this Agreement.

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(xii) All of the issued and outstanding shares of capital stock of the Company, including the outstanding shares of Common Stock, are duly authorized and validly issued, fully paid and nonassessable, have been issued in compliance with all federal and state securities laws, were not issued in violation of or subject to any preemptive rights or other rights to subscribe for or purchase securities that have not been waived in writing, and the holders thereof are not subject to personal liability by reason of being such holders; and the capital stock of the Company, including the Common Stock, conforms in all material respects to the description thereof in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus. Except as otherwise stated in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus, there are no preemptive rights or other rights to subscribe for or to purchase, or any restriction upon the voting or transfer of, any shares of Common Stock pursuant to the Company’s charter, bylaws or any agreement or other instrument to which the Company is a party or by which the Company is bound. Neither the filing of the Registration Statement nor the offering or sale of the Securities as contemplated by this Agreement gives rise to any rights for or relating to the registration of any shares of Common Stock or other securities of the Company. All of the issued and outstanding shares of capital stock of each of the Company’s Subsidiaries have been duly and validly authorized and issued and are fully paid and nonassessable, and, except as otherwise described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus and except for any directors’ qualifying shares, the Company owns of record and beneficially, free and clear of any material security interests, claims, liens, proxies, equities or other encumbrances, all of the issued and outstanding shares of such stock. Except as described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus and except for ordinary course of business grants of equity incentive awards under the Company’s stock plans, there are no options, warrants, agreements, contracts or other rights in existence to purchase or acquire from the Company or any subsidiary of the Company any shares of the capital stock of the Company or any subsidiary of the Company. Other than ordinary course of business grants of equity incentive awards under the Company’s stock plans, the Company has an authorized and outstanding capitalization as set forth in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus.

(xiii) The Company and each of its Subsidiaries holds, and is operating in compliance in all material respects with, all franchises, grants, authorizations, licenses, permits, easements, consents, certificates and orders of any governmental or self-regulatory body required for the conduct of its business and all such franchises, grants, authorizations, licenses, permits, easements, consents, certifications and orders are valid and in full force and effect; and the Company and each of its Subsidiaries is in compliance in all material respects with all applicable federal, state, local and foreign laws, regulations, orders and decrees.

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(xiv) The Company and its Subsidiaries have good and marketable title to all property (whether real or personal) described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus as being owned by them, in each case free and clear of all liens, claims, security interests, other encumbrances or defects except such as are described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus. The property held under lease by the Company and its Subsidiaries is held by them under valid, subsisting and enforceable leases with only such exceptions with respect to any particular lease as do not interfere in any material respect with the conduct of the business of the Company or its Subsidiaries.

(xv) The Company and each of its Subsidiaries owns or possesses all patents, patent applications, trademarks, service marks, tradenames, trademark registrations, service mark registrations, copyrights, licenses, inventions, trade secrets and rights necessary for the conduct of the business of the Company and its Subsidiaries as currently carried on and as described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus, except as would not result in a Material Adverse Effect; except as would not result in a Material Adverse Effect or as stated in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus, no name which the Company or any of its Subsidiaries uses and no other aspect of the business of the Company or any of its Subsidiaries will involve or give rise to any infringement of, or license or similar fees for, any patents, patent applications, trademarks, service marks, tradenames, trademark registrations, service mark registrations, copyrights, licenses, inventions, trade secrets or other similar rights of others material to the business or prospects of the Company and neither the Company nor any of its Subsidiaries has received any notice alleging any such infringement or fee.

(xvi) Neither the Company nor any of its Subsidiaries is in violation of its respective charter or by-laws or in breach of or otherwise in default, and no event has occurred which, with notice or lapse of time or both, would constitute such a default in the performance of any material obligation, agreement or condition contained in any bond, debenture, note, indenture, loan agreement or any other material contract, lease or other instrument to which it is subject or by which any of them may be bound, or to which any of the material property or assets of the Company or any of its Subsidiaries is subject.

(xvii) Except as set forth in the Time of Sale Disclosure Package and the Prospectus or as would not be reasonably expected to result in a Material Adverse Change, the Company and its Subsidiaries have timely filed all federal, state, local and foreign income and franchise tax returns required to be filed and is not in default in the payment of any taxes which were payable pursuant to said returns or any assessments with respect thereto, other than any which the Company or any of its Subsidiaries is contesting in good faith.

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(xviii) The Company has not distributed and will not distribute any prospectus or other offering material in connection with the offering and sale of the Securities other than the Time of Sale Disclosure Package or the Prospectus or the Issuer Free Writing Prospectus specified on Schedule II; provided, however, that, except as set forth on Schedule II, the Company has not made and will not make any offer relating to the Securities that would constitute a “free writing prospectus” as defined in Rule 405 under the Securities Act, except in accordance with the provisions of Section 4(a)(xvii) of this Agreement.

(xix) The Common Stock (including the Securities) is registered pursuant to Section 12(b) of the Exchange Act and is included or approved for inclusion on the Nasdaq Global Market and the Company has taken no action designed to, or likely to have the effect of, terminating the registration of the Common Stock under the Exchange Act or delisting the Common Stock from the Nasdaq Global Market nor has the Company received any notification that the Commission or the National Association of Securities Dealers, Inc. is contemplating terminating such registration or listing. The Company has complied in all material respects with the applicable requirements of the Nasdaq Global Market for maintenance of inclusion of the Common Stock thereon.

(xx) Except as described in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus, other than the subsidiaries of the Company listed in Exhibit 21 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005, Premier Devices, A Sirenza Company, Micro Linear Corporation, Premier Devices Germany Holding GmbH, Premier Devices Germany GmbH, aka Premier Devices (Shanghai) Co., Ltd., Micro Linear International and Micro Linear Sales Corporation, the Company, directly or indirectly, owns no capital stock or other equity or ownership or proprietary interest in any corporation, partnership, association, trust or other entity.

(xxi) Except as described in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus, the Company maintains a system of internal accounting controls sufficient to provide reasonable assurances that (A) transactions are executed in accordance with management’s general or specific authorization; (B) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain accountability for assets; (C) access to assets is permitted only in accordance with management’s general or specific authorization; and (D) the recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences. Except as described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus, since the most recent audit of the effectiveness of the Company’s internal control over financial reporting, there has been (i) no material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (ii) no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

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(xxii) The Company has not incurred any liability for any finder’s or broker’s fee or agent’s commission in connection with the execution and delivery of this Agreement or the consummation of the transactions contemplated hereby.

(xxiii) The Company carries, or is covered by, insurance in such amounts and covering such risks as is reasonably adequate for the conduct of its business and the value of its properties.

(xxiv) The Company is not and, after giving effect to the offering and sale of the Securities, will not be an “investment company,” as such term is defined in the Investment Company Act of 1940, as amended.

(xxv) The necessary conditions for use of Form S-3, set forth in the General Instructions thereto, have been and continue to be satisfied.

(xxvi) The documents incorporated by reference in the Time of Sale Disclosure Package and in the Prospectus, when they became effective or were filed with the Commission, as the case may be, conformed in all material respects to the requirements of the Securities Act or the Exchange Act, as applicable, and were filed on a timely basis with the Commission and none of such documents contained an untrue statement of a material fact or omitted to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; any further documents so filed and incorporated by reference in the Time of Sale Disclosure Package or in the Prospectus, when such documents are filed with the Commission, will conform in all material respects to the requirements of the Exchange Act, and will not contain an untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(xxvii) The Company is in compliance in all material respects with the applicable provisions of the Sarbanes-Oxley Act and the rules and regulations of the Commission thereunder.

(xxviii) The Company has established and maintains disclosure controls and procedures (as defined in Rules 13a-14 and 15d-14 under the Exchange Act) and such controls and procedures are effective in ensuring that material information relating to the Company, including its Subsidiaries, is made known to the principal executive officer and the principal financial officer. The Company has utilized such controls and procedures in preparing and evaluating the disclosures in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus.

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(xxix) Neither the Company nor any of its Subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its Subsidiaries is aware of or has taken any action, directly or indirectly, that would result in a violation by such persons of the FCPA (as defined below), including, without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other property, gift, promise to give, or authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign political party or official thereof or any candidate for foreign political office, in contravention of the FCPA and the Company and its Subsidiaries have conducted their businesses in compliance with the FCPA and have instituted and maintain policies and procedures designed to ensure, and which are reasonably expected to continue to ensure, continued compliance therewith. “FCPA” means the Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder.

(xxx) The operations of the Company and its Subsidiaries have complied in all material respects with applicable financial recordkeeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its Subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

(xxxi) Neither the Company nor any of its Subsidiaries nor, to the knowledge of the Company, any director, officer or employee of the Company or any of its Subsidiaries is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Department of the Treasury.

(xxxii) To the Company’s knowledge, except as disclosed to counsel to the Underwriter, no transaction has occurred between or among the Company and its Subsidiaries, on the one hand, and any of the Company’s officers, directors or 5% stockholders or any affiliate or affiliates of any such officer, director or 5% stockholders that is required to be described that is not so described in the Registration Statement, the Time of Sale Disclosure Package and the Prospectus.

(xxxiii) The Company has submitted to NASDAQ a Notification Form: Listing of Additional Shares related to the Securities.

(b) Each Selling Stockholder represents and warrants to, and agrees with, the Underwriter and the Company as follows:

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(i) Such Selling Stockholder is the record and beneficial owner of, the Securities (other than the 3,500,000 shares issued in the name of the U.S. Bank National Association under the Escrow Agreement dated February 4, 2006 by and among the Selling Stockholders, the Company and U.S. Bank National Association (the “Escrow Agreement”), as to which the Selling Stockholders have the power to cause a sale of such 3,500,000 shares issued in the name of U.S. Bank National Association pursuant to Section 1(b) of the Escrow Agreement), and such Selling Stockholder and has, and on the Closing Date, will have, valid and marketable title to the Securities to be sold by such Selling Stockholder, free and clear of all security interests, claims, liens, restrictions on transferability, legends, proxies, equities or other encumbrances; and upon delivery of and payment for such Securities hereunder, the Underwriter will acquire valid and marketable title thereto, free and clear of any security interests, claims, liens, restrictions on transferability, legends, proxies, equities or other encumbrances. Such Selling Stockholder is selling the Securities to be sold by such Selling Stockholder for such Selling Stockholder’s own account and is not selling such Securities, directly or indirectly, for the benefit of the Company, and no part of the proceeds of such sale received by such Selling Stockholder will inure, either directly or indirectly, to the benefit of the Company other than as described in the Registration Statement and Prospectus.

(ii) Such Selling Stockholder has the power and authority to enter into this Agreement and to sell, transfer and deliver the Securities to be sold by such Selling Stockholder.

(iii) This Agreement, has been duly authorized, executed and delivered by such Selling Stockholder and constitutes a valid and binding agreement of such Selling Stockholder, enforceable in accordance with its terms, except as rights to indemnity hereunder or thereunder may be limited by federal or state securities laws and except as such enforceability may be limited by bankruptcy, insolvency, reorganization or laws affecting the rights of creditors generally and subject to general principles of equity. The execution and delivery of this Agreement and the performance of the terms hereof and the consummation of the transactions herein contemplated will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, any agreement or instrument to which such Selling Stockholder is a party or by which such Selling Stockholder is bound, or any law, regulation, order or decree applicable to such Selling Stockholder; no consent, approval, authorization or order of, or filing with, any court or governmental agency or body is required for the execution, delivery and performance of this Agreement or for the consummation of the transactions contemplated hereby, including the sale of the Securities being sold by such Selling Stockholder, except such as may be required under the Securities Act or state securities laws or blue sky laws.

(iv) Such Selling Stockholder does not have any registration or other similar rights to have any equity or debt securities registered for sale by the Company under the Registration Statement or included in the offering contemplated by this Agreement, except as described or incorporated by reference in the Registration Statement.

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(v) Such Selling Stockholder has not distributed and will not distribute any prospectus or other offering material in connection with the offering and sale of the Securities other than the Base Prospectus, the Time of Sale Disclosure Package or the Prospectus or other materials permitted by the Securities Act to be distributed by such Selling Stockholder; provided, however, that no Selling Stockholder has made nor will make any offer relating to the Securities that would constitute a “free writing prospectus” as defined in Rule 405 under the Securities Act except a Permitted Free Writing Prospectus authorized by the Company and the Underwriter for distribution in accordance with the provisions of Section 4(a)(xvii) hereof.

(vi) Such Selling Stockholder has reviewed the Registration Statement, the Time of Sale Disclosure Package and the Prospectus and neither the Registration Statement, the Time of Sale Disclosure Package nor the Prospectus contains any untrue statement of a material fact or omits to state any material fact required to be stated therein or necessary to make the statements therein not misleading regarding such Selling Stockholder, and, to the knowledge of such Selling Stockholder, the other Selling Stockholder, the Company or otherwise.

(vii) To the knowledge of such Selling Stockholder, the representations and warranties of the Company contained in paragraph (a) of this Section 2 are true and correct.

(viii) Such Selling Stockholder is familiar with and has carefully reviewed the consolidated financial information of PDI contained in the Company’s Current Report on Form 8-K/A filed on June 15, 2006, and such financial information (A) is consistent with PDI accounting records; (B) for the three months ended March 31, 2006 is stated on a basis substantially consistent with that of the audited 2005 consolidated financial statements of PDI; (C) fairly presents in all material respects the consolidated financial condition, results of operations and cash flows of PDI; (D) is prepared in accordance with U.S. generally accepted accounting principles consistently applied; and (E) does not contain any untrue statement or omit to state material information necessary to make the financial information not misleading.

(c) Any certificate signed by any officer of the Company and delivered to you or to counsel for the Underwriter shall be deemed a representation and warranty by the Company to the Underwriter as to the matters covered thereby; any certificate signed by or on behalf of any Selling Stockholder as such and delivered to you or to counsel for the Underwriter shall be deemed a representation and warranty by such Selling Stockholder to the Underwriter as to the matters covered thereby.

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3. Purchase, Sale and Delivery of Securities.

(a) On the basis of the representations, warranties and agreements herein contained, but subject to the terms and conditions herein set forth each of the Selling Stockholders agrees to sell the number of Securities set forth opposite the name of such Selling Stockholder on Schedule I hereto to the Underwriter, and the Underwriter agrees to purchase from the Selling Stockholders, the respective Securities listed on Schedule I hereto. The purchase price for the Securities shall be $7.37 per share. The obligation of the Underwriter to the Selling Stockholders shall be to purchase from the Selling Stockholders that number of Securities set forth on Schedule I hereto and represents the total number of Securities to be purchased by the Underwriter pursuant to this Agreement.

The Securities will be delivered by the Selling Stockholders to you for the account of the Underwriter against payment of the purchase price therefor by wire transfer of same day funds payable to (i) the order of the Selling Stockholders with respect to fifty percent (50%) of the purchase price and (ii) to the order of U.S. Bank National Association, as escrow agent under the Escrow Agreement with respect to fifty percent (50%) of the purchase price, at the offices of Piper Jaffray & Co., U.S. Bancorp Center, 800 Nicollet Mall, Minneapolis, Minnesota, or such other location as may be mutually acceptable, at 9:00 a.m. Central time on the third (or if the Securities are priced, as contemplated by Rule 15c6-1(c) under the Exchange Act, after 4:30 p.m. Eastern time, the fourth) full business day following the date hereof, or at such other time and date as you determine pursuant to Rule 15c6-1(a) under the Exchange Act, such time and date of delivery being herein referred to as the “Closing Date.” If you so elect, delivery of the Securities may be made by credit through full fast transfer to the accounts at The Depository Trust Company designated by the Underwriter. Certificates representing the Securities, in definitive form and in such denominations and registered in such names as you may request upon at least two business days’ prior notice to the Company, will be made available for checking and packaging not later than 10:30 a.m., Central time, on the business day next preceding the Closing Date at the offices of Piper Jaffray & Co., U.S. Bancorp Center, 800 Nicollet Mall, Minneapolis, Minnesota, or such other location as may be mutually acceptable.

4. Covenants.

(a) The Company covenants and agrees with the Underwriter as follows:

(i) During the period beginning on the date hereof and ending on the later of the Closing Date or such date, as in the opinion of counsel for the Underwriter, the Prospectus is no longer required by law to be delivered, assuming the absence of Rule 172 under the Securities Act, in connection with sales by an underwriter or dealer (the “Prospectus Delivery Period”), prior to amending or supplementing the Registration Statement), the Time of Sale Disclosure Package or the Prospectus, the Company shall furnish to the Underwriter for review a copy of each such proposed amendment or supplement, and the Company shall not file any such proposed amendment or supplement to which the Underwriter or counsel to the Underwriter reasonably object. The Underwriter shall notify the Company in writing when the Prospectus Delivery Period has been terminated.

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(ii) During the Prospectus Delivery Period, the Company shall promptly advise the Underwriter in writing (i) of the receipt of any comments of, or requests for additional or supplemental information from, the Commission, (ii) of the time and date of any filing of any post-effective amendment to the Registration Statement or any amendment or supplement to the Base Prospectus, the Time of Sale Disclosure Package or the Prospectus, (iii) of the time and date that any post-effective amendment to the Registration Statement becomes effective and (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or any post-effective amendment thereto or of any order preventing or suspending its use or the use of the Base Prospectus, the Time of Sale Disclosure Package, the Prospectus or any Issuer Free Writing Prospectus, or of any proceedings to remove, suspend or terminate from listing or quotation the Common Stock from any securities exchange upon which it is listed for trading or included or designated for quotation, or of the threatening or initiation of any proceedings for any of such purposes. If the Commission shall enter any such stop order at any time, the Company will use its reasonable best efforts to obtain the lifting of such order at the earliest possible moment. Additionally, the Company agrees that it shall comply with the provisions of Rules 424(b), 430A and 430B, as applicable, under the Securities Act and will use its reasonable efforts to confirm that any filings made by the Company under Rule 424(b) or Rule 433 were received in a timely manner by the Commission (without reliance on Rule 424(b)(8) or Rule 164(b)).

(iii) (A) During the Prospectus Delivery Period, the Company will comply in all material respects with all requirements imposed upon it by the Securities Act, as now and hereafter amended, and by the Rules and Regulations, as from time to time in force, and by the Exchange Act so far as necessary to permit the continuance of sales of or dealings in the Securities as contemplated by the provisions hereof, the Time of Sale Disclosure Package and the Prospectus. If during such Prospectus Delivery Period any event occurs as a result of which the Prospectus (or if the Prospectus is not yet available to prospective purchasers, the Time of Sale Disclosure Package) would include an untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances then existing, not misleading, or if during such period it is necessary or appropriate in the opinion of the Company or its counsel or the Underwriter or counsel to the Underwriter to amend the Registration Statement or supplement the Prospectus (or, if the Prospectus is not yet available to prospective purchasers, the Time of Sale Disclosure Package) to comply with the Securities Act or to file under the Exchange Act any document which would be deemed to be incorporated by reference in the Prospectus in order to comply with the Securities Act or the Exchange Act, the Company will promptly notify you and will amend the Registration Statement or supplement the Prospectus (or, if the Prospectus is not yet available to prospective purchasers, the Time of Sale Disclosure Package) or file such document (at the expense of the Company) so as to correct such statement or omission or effect such compliance.

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(B) If during the Prospectus Delivery Period there occurs an event or development as a result of which an Issuer Free Writing Prospectus conflicted or would conflict with the information contained in the Registration Statement, the Base Prospectus or the Prospectus or included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at that subsequent time, not misleading, the Company has promptly notified or promptly will notify the Underwriter and has promptly amended or will promptly amend or supplement, at its own expense, such Issuer Free Writing Prospectus to eliminate or correct such conflict, untrue statement or omission.

(iv) The Company shall take or cause to be taken all necessary action to qualify the Securities for sale under the securities laws of such jurisdictions as you reasonably designate and to continue such qualifications in effect for the Prospectus Delivery Period, except that the Company shall not be required in connection therewith to qualify as a foreign corporation or to execute a general consent to service of process in any state.

(v) The Company will furnish or make available to the Underwriter and counsel for the Underwriter copies of the Registration Statement, the Time of Sale Disclosure Package, the Prospectus, any Issuer Free Writing Prospectus, and all amendments and supplements to such documents, in each case as soon as available and in such quantities as you may from time to time reasonably request.

(vi) During a period of two years commencing with the date hereof, the Company will furnish or make available to the Underwriter, promptly after request therefor, copies of all periodic and special reports furnished to the stockholders of the Company and all other publicly available information, documents and reports filed with the Commission, the National Association of Securities Dealers, Inc., the Nasdaq Global Market or any securities exchange (other than any such information, documents and reports that are filed with the Commission electronically via EDGAR or any successor system).

(vii) The Company will make generally available to its security holders pursuant to its filing of Exchange Act reports with the Commission electronically via EDGAR or any successor system not later than 15 months after the end of the Company’s current fiscal quarter, an earnings statement (which need not be audited) covering a 12-month period that shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158 of the Rules and Regulations.

(viii) The Company, whether or not the transactions contemplated hereunder are consummated or this Agreement is terminated, will pay or cause to be paid (A) all fees and expenses of the Company’s accountants, counsel and financial printers

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in connection with the preparation, printing, filing, delivery, and shipping of the Registration Statement (including the financial statements therein and all amendments, schedules, and exhibits thereto), the Securities, the Time of Sale Disclosure Package, the Prospectus, any Issuer Free Writing Prospectus and any amendment thereof or supplement thereto, (B) the fees and expenses of any transfer agent or registrar and (C) listing fees, if any.

(ix) The Company’s Insider Trading Policy, in the form delivered to counsel for the Underwriter, is currently in force and has been duly adopted by all necessary corporate action by the Company. For 30 days after the date of the Prospectus, the Company may not amend or alter such Insider Trading Policy and may not waive any provision thereof. In addition, for 30 days after the date of the Prospectus, the Company may not preclear any trades of Common Stock, except trades made pursuant to 10b5-1 plans, for any person who has an effective 10b5-1 plan and is subject to the Insider Trading Policy.

(x) The Company has not taken and will not take, directly or indirectly, any action designed to or which might reasonably be expected to cause or result in, or which has constituted, the stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities

(xi) The Company will not incur any liability for any finder’s or broker’s fee or agent’s commission in connection with the execution and delivery of this Agreement or the consummation of the transactions contemplated hereby.

(xii) During the Prospectus Delivery Period, the Company will file on a timely basis with the Commission such periodic and current reports as required by the Rules and Regulations.

(xiii) The Company represents and agrees that, unless it obtains the prior written consent of the Underwriter, it has not made and will not make any offer relating to the Securities that would constitute an “issuer free writing prospectus,” as defined in Rule 433 under the Securities Act, or that would otherwise constitute a “free writing prospectus,” as defined in Rule 405 under the Securities Act, required to be filed with the Commission; provided that the prior written consent of the parties hereto shall be deemed to have been given in respect of the free writing prospectuses included in Schedule II. Any such free writing prospectus consented to by the Company and the Underwriter will be listed on Schedule II of this Agreement under Issuer Free Writing Prospectus. The Company represents that it has treated or agrees that it will treat each Issuer Free Writing Prospectus as an “issuer free writing prospectus,” as defined in Rule 433, and has complied and will comply with the requirements of Rule 433 applicable to any Permitted Free Writing Prospectus, including timely Commission filing where required, legending and record keeping.

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(b) Each Selling Stockholder covenants and agrees with the Underwriter and the Company as follows:

(i) Except as otherwise agreed to by the Company and such Selling Stockholder pursuant to an outstanding registration rights agreement, a true and correct copy of which has been delivered to counsel to the Underwriter, such Selling Stockholder will pay all taxes, if any, on the transfer and sale, respectively, of the Securities being sold by such Selling Stockholder, the fees of such Selling Stockholder’s counsel and such Selling Stockholder’s proportionate share (based upon the number of Securities being offered by such Selling Stockholder pursuant to the Registration Statement) of all costs and expenses (except for legal and accounting expenses and fees of the registrar and transfer agent) incurred by the Company pursuant to the provisions of Section 4(a)(viii) of this Agreement; provided, however, that each Selling Stockholder severally agrees to reimburse the Company for any reimbursement made by the Company to the Underwriter pursuant to Section 4(a)(viii) hereof to the extent such reimbursement resulted from the failure or refusal on the part of such Selling Stockholder to comply under the terms or fulfill any of the conditions of this Agreement.

(ii) If this Agreement is terminated by the Underwriter pursuant to Section 9 hereof or if the sale of the Securities provided for herein is not consummated by reason of any failure, refusal or inability on the part of the Company or any Selling Stockholder to perform any agreement on its or their part to be performed, or because any other condition of the Underwriter’s obligations hereunder required to be fulfilled by the Company or any Selling Stockholder is not fulfilled, the Selling Stockholders, jointly and severally, will reimburse the Underwriter for all out-of-pocket disbursements (including but not limited to fees and disbursements of counsel for the Underwriter, printing expenses, travel expenses, postage, facsimile and telephone charges) incurred by the Underwriter in connection with their investigation, preparing to market and marketing the Securities or in contemplation of performing their obligations hereunder.

(iii) The Securities to be sold by such Selling Stockholder are subject to the interest of the Underwriter and the other Selling Stockholder and the obligations of such Selling Stockholder hereunder shall not be terminated, except as provided in this Agreement, by any act of such Selling Stockholder, by operation of law, whether by the liquidation, dissolution or merger of such Selling Stockholder, by the death of such Selling Stockholder, or by the occurrence of any other event. If any Selling Stockholder should liquidate, dissolve or be a party to a merger or if any other such event should occur before the delivery of the Securities hereunder, certificates for the Securities shall be delivered in accordance with the terms and conditions of this Agreement as if such liquidation, dissolution, merger or other event had not occurred.

(iv) Such Selling Stockholder will not, without the prior written consent of the Underwriter, from the date of execution of this Agreement and continuing to and including the date 60 days after the date of the Prospectus (the “Lock-Up Period”), offer for sale, sell, contract to sell, pledge, grant any option for the sale of, enter into any transaction which is designed

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to, or might reasonably be expected to, result in disposition (whether by actual disposition or effective economic disposition due to cash settlement or otherwise) or otherwise dispose of, directly or indirectly (or publicly disclose the intention to make any such offer, sale, pledge, grant, or other disposition), any Common Stock or any securities convertible into or exchangeable for, or any options or rights to purchase or acquire, Common Stock, except to the Underwriter pursuant to this Agreement. In addition, each Selling Stockholder agrees that, without the prior written consent of the Underwriter it will not, during the Lock-Up Period, make any demand for or exercise any right with respect to, the registration of any shares of Common Stock or any security convertible into or exercisable or exchangeable for shares of Common Stock. If (1) during the period that begins on the date that is 18 calendar days before the last day of the Lock-Up Period and ends on the last day of the Lock-Up Period, (a) the Company issues an earnings release, (b) the Company publicly announces material news or (c) a material event relating to the Company occurs; or (2) prior to the expiration of the Lock-Up Period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the Lock-Up Period, then the restrictions in this Agreement, unless otherwise waived by the Underwriter in writing, shall continue to apply until the expiration of the date that is 18 calendar days after the date on which (a) the Company issues the earnings release, (b) the Company publicly announces material news or (c) a material event relating to the Company occurs. Any shares of Common stock received upon exercise of options granted to a Selling Stockholder will also be subject to this clause (iv). The restrictions on transfers of this clause (iv), however, will not apply to any shares of Common Stock acquired by the Selling Stockholder in the open market. A transfer of shares of Common Stock in connection with a bona fide gift or to a family member or trust may be made, provided the transferee agrees to be bound in writing by the terms of this Agreement.

(v) Such Selling Stockholder has not taken and will not take, directly or indirectly, any action designed to or which might reasonably be expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities.

(vi) Such Selling Stockholder shall immediately notify you if any event occurs, or of any change in information relating to such Selling Stockholder or the Company or any new information relating to the Company or relating to any matter stated in the Time of Sale Disclosure Package or in the Prospectus or any supplement thereto or any Issuer General Free Writing Prospectus, which results in the Time of Sale Disclosure Package or in the Prospectus (as amended or supplemented) or any Issuer General Free Writing Prospectus including an untrue statement of a material fact or omitting to state any material fact necessary to make the statements therein, in light of the circumstances under which they were made, not misleading.

(vii) Such Selling Stockholder shall deliver to the Underwriter, prior to the Closing Date, a properly completed and executed United States Treasury Department Form W-9 (or other applicable form or statement specified by Treasury Department regulations in lieu thereof).

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(viii) Such Selling Stockholder, whether or not the transactions contemplated hereunder are consummated or this Agreement is terminated, will pay or cause to be paid (A) all expenses (including transfer taxes allocated to the respective transferees) incurred in connection with the delivery to the Underwriter of the Securities, (B) all expenses and fees (excluding fees and expenses of the Company’s accountants and counsel and, except as otherwise provided below, fees of the Underwriter’s counsel) in connection with the preparation, printing, filing, delivery, and shipping of the Registration Statement (including the financial statements therein and all amendments, schedules, and exhibits thereto), the Securities, the Time of Sale Disclosure Package, the Prospectus, any Issuer Free Writing Prospectus and any amendment thereof or supplement thereto, and the printing, delivery, and shipping of this Agreement and other underwriting documents, including Blue Sky Memoranda (covering the states and other applicable jurisdictions), (C) all filing fees and fees and disbursements of the Underwriter’s counsel incurred in connection with the qualification of the Securities for offering and sale by the Underwriter or by dealers under the securities or blue sky laws of the states and other jurisdictions which you shall designate, (D) the filing fees and fees and disbursements of Underwriter’s counsel incident to any required review and approval by the National Association of Securities Dealers, Inc. of the terms of the sale of the Securities, and (E) all other costs and expenses incident to the performance of its obligations hereunder that are not otherwise specifically provided for herein; provided, however, that none of the foregoing shall be deemed to include (i) any fees and expenses of the escrow agent under the Escrow Agreement dated February 4, 2006 among the Company, the Selling Stockholders and U.S. Bank National Association (the “Escrow Agreement”), which fees and expenses will be borne by the parties thereto as specified therein; (ii) any fees and expenses related to the Registration Statement or the Base Prospectus incurred by the Company prior to December 21, 2006 (collectively, the fees and expenses described in clauses (i) and (ii) herein are referred to as the “Excluded Expenses”). The Selling Stockholders shall, within five days following the receipt of invoices from the Company, reimburse the Company for all expenses incurred by the Company pursuant to Section 4(a)(viii) of this Agreement (other than the Excluded Expenses), and in the event that the Selling Stockholders fail to reimburse the Company with the time period required by this Section, the Company can set-off any amounts due to the Company by the Selling Stockholders pursuant to this Section against that certain Promissory Note, dated April 3, 2006, between the Company and Phillip Chuanze Liao.

(ix) The Selling Stockholder will not incur any liability for any finder’s or broker’s fee or agent’s commission in connection with the execution and delivery of this Agreement or the consummation of the transactions contemplated hereby.

5. Conditions of Underwriter’s Obligations. The obligations of the Underwriter hereunder are subject to the accuracy, as of the date hereof and at the Closing Date (as if made at such Closing Date), of and compliance with all representations, warranties and

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agreements of the Company and the Selling Stockholders contained herein, to the performance by the Company and the Selling Stockholders of their respective obligations hereunder and to the following additional conditions:

(a) If filing of the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus, is required under the Securities Act or the Rules and Regulations, the Company shall have filed the Prospectus (or such amendment or supplement) or such Issuer Free Writing Prospectus with the Commission in the manner and within the time period so required (without reliance on Rule 424(b)(8) or Rule 164(b)); the Registration Statement shall remain effective; no stop order suspending the effectiveness of the Registration Statement or any part thereof or any amendment thereof, nor suspending or preventing the use of the Time of Sale Disclosure Package, the Prospectus or any Issuer Free Writing Prospectus shall have been issued; no proceedings for the issuance of such an order shall have been initiated or threatened; any request of the Commission for additional information (to be included in the Registration Statement, the Time of Sale Disclosure Package, the Prospectus, any Issuer Free Writing Prospectus or otherwise) shall have been complied with to your satisfaction; and the NASD shall have raised no objection to the fairness and reasonableness of the underwriting terms and arrangements.

(b) The Underwriter shall not have advised the Company that the Registration Statement, the Time of Sale Disclosure Package or the Prospectus, or any amendment thereof or supplement thereto, or any Issuer Free Writing Prospectus, contains an untrue statement of fact which, in your reasonable opinion (after consultation with Faegre & Benson LLP, counsel for the Underwriter), is material, or omits to state a fact which in your reasonable opinion (after consultation with Faegre & Benson LLP, counsel for the Underwriter), is material and is required to be stated therein or necessary to make the statements therein not misleading.

(c) Except as contemplated in the Time of Sale Disclosure Package and in the Prospectus, subsequent to the respective dates as of which information is given in the Time of Sale Disclosure Package, neither the Company nor any of its Subsidiaries shall have incurred any material liabilities or obligations, direct or contingent, or entered into any material transactions, or declared or paid any dividends or made any distribution of any kind with respect to its capital stock; and there shall not have been any material change in the capital stock (other than a change in the number of outstanding shares of Common Stock due to the issuance of shares upon the exercise of outstanding options or warrants), or any material change in the short-term or long-term debt of the Company, or, other than ordinary course of business grants of equity incentive awards under the Company’s stock plans, any issuance of a material amount of options, or any issuance of warrants, convertible securities or other rights to purchase the capital stock of the Company or any of its Subsidiaries, or any Material Adverse Change or any development involving a prospective Material Adverse Change (whether or not arising in the ordinary course of business), or any material loss by strike, fire, flood, earthquake, accident or other calamity, whether or not covered by insurance, incurred by the Company or any Subsidiary, the effect of which, in any such case described above, in your judgment, makes it impractical or inadvisable to offer or deliver the Securities on the terms and in the manner contemplated in the Time of Sale Disclosure Package and in the Prospectus.

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(d) On the Closing Date, there shall have been furnished to you, as Underwriter, the opinion of Wilson Sonsini Goodrich & Rosati, counsel for the Company, dated such Closing Date and addressed to you, to the effect that:

(i) Each of the Company and Premier Devices, A Sirenza Company, has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware and the State of California, respectively. Each of the Company and such subsidiary has full corporate power and authority to own its properties and conduct its business as described in the Registration Statement, in the Time of Sale Disclosure Package and in the Prospectus, and is duly qualified to do business as a foreign corporation and is in good standing in each jurisdiction listed in a schedule to such counsel’s opinion.

(ii) The Securities have been authorized and validly issued and are fully paid and nonassessable. There are no preemptive rights to subscribe for or to purchase any shares of Common Stock pursuant to the Company’s charter, by-laws or any Reviewed Agreement (as defined below).

(iii) The Registration Statement has become effective under the Securities Act and, to such counsel’s knowledge, no stop order suspending the effectiveness of the Registration Statement has been issued and no proceeding for that purpose has been instituted.

(iv) The Common Stock of the Company conforms in all material respects as to legal matters to the description thereof contained in the Time of Sale Disclosure Package and in the Prospectus under the caption “Description of Capital Stock.”

(v) The Company has the corporate power and authority to enter into this Agreement, and this Agreement has been duly authorized, executed and delivered by the Company.

(vi) The execution, delivery and performance of this Agreement and the consummation of the transactions herein contemplated will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, any U.S. federal, New York, California or Delaware General Corporation Law (“DGCL”) statute rule or regulation, any Reviewed Agreement, the Company’s charter or by-laws, or any U.S. federal, New York, California or Delaware reviewed judgment listed on a schedule to such counsel’s opinion. For purposes of such opinion, Reviewed Agreement shall mean those agreements or contracts that would be filed by the Company as an exhibit to the Company’s Annual Report on Form 10-K to the extent such report was filed for the first time as of the date of such opinion, as certified in writing by the Company to such counsel.

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(vii) No consent, approval, authorization or order of, or filing with, any U.S. federal, New York, California or Delaware court or governmental agency or body is required for the execution, delivery and performance of this Agreement or for the consummation of the transactions contemplated hereby, except such as may be required under the Securities Act or state securities laws.

(viii) The Registration Statement, the Base Prospectus included in the Time of Sale Disclosure Package and the Prospectus, and any amendment thereof or supplement thereto, comply, and as of their respective effective or issue dates (including without limitation each deemed effective date with respect to the Underwriter pursuant to the Rules and Regulations) complied, as to form in all material respects with the requirements of the Securities Act and the Rules and Regulations; the conditions for use of Form S-3, set forth in the General Instructions thereto, have been satisfied.

In addition, such counsel shall include a statement to the effect that such counsel has participated in conferences with certain officers and other representatives of the Company, counsel for the Underwriter and the independent certified public accountants of the Company, at which conferences the contents of the Registration Statement, the Prospectus and the information set forth on an exhibit to such counsel’s opinion (the scheduled information, taken together with the Base Prospectus, the “Time of Sale Disclosure Package”) and related matters were reviewed and discussed, and that although such counsel does not assume any responsibility for the accuracy, completeness or fairness of the information contained in the Registration Statement, the Prospectus or any other information that is part of the Time of Sale Disclosure Package, no facts have come to such counsel’s attention, in the course of such review and discussion, that have caused such counsel to believe that,

(i) the Registration Statement at the time it became effective contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary in order to make the statements therein not misleading (other than the financial statements and related schedules and the financial and statistical data based on or derived from such financial statements or schedules, as to which such counsel expresses no belief);

(ii) the documents and scheduled information included in the Time of Sale Disclosure Package, all considered together, as of 1:35 P.M. (PST) on February 15, 2007 (the “Applicable Time”) and as of the Closing Date, contained an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading (other than the financial statements and related schedules and the financial and statistical data based on or derived from such financial statements or schedules, as to which such counsel expresses no belief); or

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(iii) the Prospectus, as of its date or as of the Closing Date, contained an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading (other than financial statements and related schedules and the financial and statistical data based on or derived from such financial statements or schedules, as to which such counsel expresses no belief).

(e) On the Closing Date, there shall have been furnished to you, as Underwriter, the opinion of Orrick, Herrington & Sutcliffe LLP, counsel for the Selling Stockholders, dated such Closing Date and addressed to you, to the effect that:

(i) Each of the Selling Stockholders is the sole record owner of the Securities (other than the 3,500,000 shares issued in the name of the U.S. Bank National Association under the Escrow Agreement, as to which the Selling Stockholders have the power to cause a sale of such 3,500,000 shares issued in the name of U.S. Bank National Association pursuant to Section 1(b) of the Escrow Agreement) to be sold by such Selling Stockholder and delivery of the certificates for the Securities to be sold by each Selling Stockholder pursuant to this Agreement, upon payment therefor by the Underwriter, will pass marketable title to such Securities to the Underwriter and the Underwriter will acquire all the rights of such Selling Stockholder in the Securities (assuming the Underwriter has no knowledge of an adverse claim), free and clear of any adverse claim.

(ii) Each of the Selling Stockholders has the power and authority to enter into this Agreement and to perform and discharge such Selling Stockholder’s obligations hereunder; and this Agreement, has been duly and validly authorized, executed and delivered by the Selling Stockholders and is a valid and binding agreement of the Selling Stockholders, enforceable in accordance with its terms (except as rights to indemnity hereunder may be limited by federal or state securities laws and except as such enforceability may be limited by bankruptcy, insolvency, reorganization or similar laws affecting creditors’ rights generally and subject to general principles of equity).

(iii) The execution and delivery of this Agreement, and the performance of the terms hereof and the consummation of the transactions herein contemplated will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, any statute, rule or regulation, or any agreement or instrument known to such counsel to which such Selling Stockholder is a party or by which such Selling Stockholder is bound or to which any of its property is subject, or any order or decree known to such counsel of any court or government agency or body having jurisdiction over such Selling Stockholder or any of its respective properties; and no consent, approval, authorization or order of, or filing with, any court or governmental agency or body is required for the execution, delivery and performance of this Agreement or for the consummation of the transactions contemplated hereby, including the sale of the Securities being sold by such Selling Stockholder, except such as may be required under the Securities Act or state securities laws or blue sky laws.

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In rendering such opinion such counsel may rely (i) as to matters of law other than Delaware and federal law, upon the opinion or opinions of local counsel provided that the extent of such reliance is specified in such opinion and that such counsel shall state that such opinion or opinions of local counsel are satisfactory to them and that they believe they and you are justified in relying thereon and (ii) as to matters of fact, to the extent such counsel deems reasonable upon certificates of officers of the Selling Stockholders provided that the extent of such reliance is specified in such opinion.

(f) On the Closing Date, there shall have been furnished to you, as Underwriter, such opinion or opinions from Faegre & Benson LLP, counsel for the Underwriter, dated such Closing Date and addressed to you, with respect to such matters as you reasonably may request, and such counsel shall have received such papers and information as they request to enable them to pass upon such matters.

(g) On the Closing Date you, as Underwriter, shall have received a letter of Ernst & Young LLP, and PricewaterhouseCoopers LLP, dated as of the Closing Date and addressed to you, confirming that they are independent public accountants within the meaning of the Securities Act and are in compliance with the applicable requirements relating to the qualifications of accountants under Rule 2-01 of Regulation S-X of the Commission, and stating, as of the date of such letter (or, with respect to matters involving changes or developments since the respective dates as of which specified financial information is given in the Time of Sale Disclosure Package, as of a date not more than five days prior to the date of such letter), the conclusions and findings of said firm with respect to the financial information and other matters covered by its letter delivered to you concurrently with the execution of this Agreement, and the effect of the letter so to be delivered on such Closing Date shall be to confirm the conclusions and findings set forth in such prior letter.

(h) On the Closing Date, there shall have been furnished to you, as Underwriter, a certificate, dated such Closing Date and addressed to you, signed on behalf of the Company by the chief executive officer and by the chief financial officer of the Company, to the effect that:

(i) The representations and warranties of the Company in this Agreement are true and correct, in all material respects, as if made at and as of the Closing Date, and the Company has complied with all the agreements and satisfied all the conditions on its part to be performed or satisfied at or prior to the Closing Date;

(ii) No stop order or other order suspending the effectiveness of the Registration Statement or any part thereof or any amendment thereof or the qualification of the Securities for offering or sale nor suspending or preventing the use of the Time of Sale Disclosure Package, the Prospectus or any Issuer Free Writing Prospectus, has been issued, and no proceeding for that purpose has been instituted or, to the best of their knowledge, is threatened by the Commission or any state or regulatory body; and

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(iii) The signers of said certificate have carefully examined the Registration Statement, the Time of Sale Disclosure Package and the Prospectus, and any amendments thereof or supplements thereto (including any documents filed under the Exchange Act and deemed to be incorporated by reference into the Time of Sale Disclosure Package and the Prospectus), and

(A) since the Time of Sale, there has occurred no event required to be set forth in an amended or supplemented prospectus which has not been so set forth, and there has been no document required to be filed under the Exchange Act that upon such filing would be deemed to be incorporated by reference into the Time of Sale Disclosure Package or into the Prospectus that has not been so filed,

(B) except as contemplated in the Time of Sale Disclosure Package and in the Prospectus, subsequent to the respective dates as of which information is given in the Time of Sale Disclosure Package, neither the Company nor any of its Subsidiaries has incurred any material liabilities or obligations, direct or contingent, or entered into any material transactions, not in the ordinary course of business, or declared or paid any dividends or made any distribution of any kind with respect to its capital stock, and except as disclosed in the Time of Sale Disclosure Package and in the Prospectus, there has not been any material change in the capital stock (other than a change in the number of outstanding shares of Common Stock due to the issuance of shares upon the exercise of outstanding options or warrants), or any material change in the short-term or long-term debt, or, other than ordinary course of business grants of equity incentive awards under the Company’s stock plans, any issuance of options, warrants, convertible securities or other rights to purchase the capital stock, of the Company, or any of its Subsidiaries, or any Material Adverse Change or any development involving a prospective Material Adverse Change (whether or not arising in the ordinary course of business), or any material loss by strike, fire, flood, earthquake, accident or other calamity, whether or not covered by insurance, incurred by the Company or any Subsidiary, and

(C) except as stated in the Time of Sale Disclosure Package and in the Prospectus, there is not pending, or, to the knowledge of the Company, threatened, any action, suit or proceeding to which the Company or any of its Subsidiaries is a party before or by any court or governmental agency, authority or body, or any arbitrator, which would reasonably be expected to result in any Material Adverse Change if decided against the Company.

(iv) The signers of said certificate have carefully reviewed the financial information for the three months and year ended December 31, 2006 contained in the Company’s Current Report on Form 8-K dated February 15, 2007, and such financial information

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(A) is consistent with Company accounting records,

(B) is stated on a basis substantially consistent with that of the audited 2005 financial statements of the Company, and

(C) fairly presents in all material respects the financial condition and condensed results of operations of the Company.

(i) On the Closing Date, there shall have been furnished to you, as Underwriter, a certificate or certificates, dated such Closing Date and addressed to you, signed by each of the Selling Stockholders to the effect that the representations and warranties of such Selling Stockholder contained in this Agreement are true and correct as if made at and as of such Closing Date, and that such Selling Stockholder has complied with all the agreements and satisfied all the conditions on such Selling Stockholder’s part to be performed or satisfied at or prior to such Closing Date.

(j) The Company shall have furnished to you and counsel for the Underwriter such additional documents, certificates and evidence as you or they may have reasonably requested.

All such opinions, certificates, letters and other documents will be in compliance with the provisions hereof only if they are satisfactory in form and substance to you and counsel for the Underwriter. The Company will furnish you with such conformed copies of such opinions, certificates, letters and other documents as you shall reasonably request.

6. Indemnification and Contribution.

(a)(i) The Company agrees to indemnify and hold harmless the Underwriter against any losses, claims, damages or liabilities, joint or several, to which the Underwriter may become subject, under the Securities Act or otherwise (including in settlement of any litigation if such settlement is effected with the written consent of the Company), insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, including the information deemed to be a part of the Registration Statement at the time of effectiveness and at any subsequent time pursuant to Rules 430A and 430B of the Rules and Regulations, if applicable, the Time of Sale Disclosure Package, the Prospectus, or any amendment or supplement thereto (including any documents filed under the Exchange Act and deemed to be incorporated by reference into the Prospectus), or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and will reimburse the Underwriter for any legal or other expenses reasonably incurred by it in connection with investigating or defending against such loss, claim, damage, liability or action; provided, however, that the Company shall not be liable in any such case to the extent that any such loss, claim, damage, liability or action arises out of or is based upon an untrue

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statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, the Time of Sale Disclosure Package, the Prospectus, or any such amendment or supplement, in reliance upon and in conformity with written information furnished to the Company by you specifically for use in the preparation thereof;

(ii) Each Selling Stockholder, jointly and severally, agrees to indemnify and hold harmless the Underwriter against any losses, claims, damages or liabilities to which the Underwriter may become subject, under the Securities Act or otherwise (including in settlement of any litigation if such settlement is effected with the written consent of a Selling Stockholder), insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon (i) an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, including the information deemed to be a part of the Registration Statement at the time of effectiveness and at any subsequent time pursuant to Rules 430A and 430B of the Rules and Regulations, if applicable, the Time of Sale Disclosure Package, the Prospectus, or any amendment or supplement thereto (including any documents filed under the Exchange Act and deemed to be incorporated by reference into the Prospectus), or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading; or (ii) in whole or in part upon any inaccuracy in the representations and warranties of the Selling Stockholders contained herein; or (iii) in whole or in part upon any failure of the Selling Stockholders to perform their respective obligations hereunder or under law; provided, however, that the Selling Stockholders shall not be liable in any such case to the extent that any such loss, claim, damage, liability or action arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, the Time of Sale Disclosure Package, the Prospectus, or any such amendment or supplement, any Issuer Free Writing Prospectus, in reliance upon and in conformity with written information furnished to the Company by you specifically for use in the preparation thereof; and further provided, however, that in no event shall the aggregate liability of any Selling Stockholder under the provisions of this Agreement for indemnification, contribution, reimbursement of expenses, and breach of any representation or warranty, exceed the proceeds (net of underwriting discounts and commissions) such Selling Stockholder received from the sale of the Securities pursuant to this Agreement.

In addition to their other obligations under this Section 6(a), each Selling Stockholder, jointly and severally, agrees that, as an interim measure during the pendency of any claim, action, investigation, inquiry or other proceeding arising out of or based upon any statement or omission, or any alleged statement or omission, described in this Section 6(a), they will reimburse the Underwriter on a monthly basis for all reasonable legal fees or other expenses incurred in connection with investigating or defending any such claim, action, investigation, inquiry or other proceeding, notwithstanding the absence of a judicial determination as to the propriety and enforceability of the Selling Stockholder’s obligation to reimburse the Underwriter for such expenses and the possibility that such payments might later be held to have been improper by a court of competent jurisdiction. To the extent that any such interim reimbursement payment is so held to have been improper, the Underwriter shall promptly return it to the party or parties that made such payment, together with interest, compounded daily, determined on the basis of the prime rate (or other commercial lending rate

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for borrowers of the highest credit standing) announced from time to time by the Wall Street Journal (the “Prime Rate”). Any such interim reimbursement payments which are not made to the Underwriter within 30 days of a request for reimbursement shall bear interest at the Prime Rate from the date of such request. This indemnity agreement shall be in addition to any liabilities which the Selling Stockholders may otherwise have.

(b) The Underwriter will indemnify and hold harmless the Company and the Selling Stockholders against any losses, claims, damages or liabilities to which the Company and the Selling Stockholders may become subject, under the Securities Act or otherwise (including in settlement of any litigation, if such settlement is effected with the written consent of the Underwriter), insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, the Time of Sale Disclosure Package, the Prospectus, or any amendment or supplement thereto or any Issuer Free Writing Prospectus, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, the Time of Sale Disclosure Package, the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus in reliance upon and in conformity with written information furnished to the Company by you, specifically for use in the preparation thereof, and will reimburse the Company and the Selling Stockholders for any legal or other expenses reasonably incurred by the Company or any such Selling Stockholder in connection with investigating or defending against any such claim, action, investigation, inquiry or other proceeding.

(c) Promptly after receipt by an indemnified party under subsection (a) or (b) above of notice of the commencement of any action, such indemnified party shall, if a claim in respect thereof is to be made against the indemnifying party under such subsection, notify the indemnifying party in writing of the commencement thereof; but the omission so to notify the indemnifying party shall not relieve the indemnifying party from any liability that it may have to any indemnified party except to the extent such indemnifying party has been materially prejudiced by such failure. In case any such action shall be brought against any indemnified party, and it shall notify the indemnifying party of the commencement thereof, the indemnifying party shall be entitled to participate in, and, to the extent that it shall wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel satisfactory to such indemnified party, and after notice from the indemnifying party to such indemnified party of the indemnifying party’s election so to assume the defense thereof, the indemnifying party shall not be liable to such indemnified party under such subsection for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof other than reasonable costs of investigation.

The indemnifying party under this Section 6 shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to

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indemnify the indemnified party against any loss, claim, damage, liability or expense by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by this Section 6, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement, compromise or consent to the entry of judgment in any pending or threatened action, suit or proceeding in respect of which any indemnified party is or could have been a party and indemnity was or could have been sought hereunder by such indemnified party, unless such settlement, compromise or consent (a) includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such action, suit or proceeding and (b) does not include a statement as to or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party.

(d) If the indemnification provided for in this Section 6 is unavailable or insufficient to hold harmless an indemnified party under subsection (a) or (b) above, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of the losses, claims, damages or liabilities referred to in subsection (a) or (b) above, (i) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Selling Stockholders on the one hand and the Underwriter on the other, from the offering of the Securities or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company, the Selling Stockholders and the Underwriter, as applicable, in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Selling Stockholders on the one hand and the Underwriter on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Selling Stockholders bear to the total underwriting discounts and commissions received by the Underwriter, in each case as set forth in the table on the cover page of the Prospectus. The relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company, the Selling Stockholders or the Underwriter and the parties’ relevant intent, knowledge, access to information and opportunity to correct or prevent such untrue statement or omission. The Company, the Selling Stockholders and the Underwriter agree that it would not be just and equitable if contributions pursuant to this subsection (d) were to be determined by pro rata allocation or by any other method of allocation which does not take account of the equitable considerations referred to in the first sentence of this subsection (d). The amount paid by an indemnified party as a result of the losses, claims, damages or liabilities referred to in the first sentence of this subsection (d) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending against any action or claim which is the subject of this subsection (d). Notwithstanding the provisions

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of this subsection (d), the Underwriter shall not be required to contribute any amount in excess of the amount by which the total price at which the Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that the Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission and the aggregate liability under this subsection (d) of the Selling Stockholders under the provisions of this Agreement for indemnification, contribution, reimbursement of expenses, and breach of any representation or warranty shall be limited to an amount equal to the aggregate amount of proceeds (net of underwriting commissions and discounts) the Selling Stockholders received from the sale of Securities pursuant to this Agreement. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.

(e) The obligations of the Company and the Selling Stockholders under this Section 6 shall be in addition to any liability which the Company and the Selling Stockholders may otherwise have and shall extend, upon the same terms and conditions, to each person, if any, who controls any Underwriter within the meaning of the Securities Act; and the obligations of the Underwriter under this Section 6 shall be in addition to any liability that the Underwriter may otherwise have and shall extend, upon the same terms and conditions, to each director of the Company (including any person who, with his consent, is named in the Registration Statement as about to become a director of the Company), to each officer of the Company who has signed the Registration Statement and to each person, if any, who controls the Company within the meaning of the Securities Act or any Selling Stockholder.

(f) The Underwriter confirms and the Company and each Selling Stockholder acknowledges that the statements with respect to the public offering of the Securities by the Underwriter set forth in the table and the sixth paragraph on the cover of the Prospectus, the second, fourth, ninth, tenth, eleventh and twelfth paragraphs under the heading “Underwriting” in the Time of Sale Disclosure Package and in the Prospectus and the second sentence of the third row, the fourth row and the fifth row of the table in the Issuer Free Writing Prospectus are correct and constitute the only information concerning the Underwriter furnished in writing to the Company by or on behalf of the Underwriter specifically for inclusion in the Registration Statement, the Time of Sale Disclosure Package, the Prospectus or any Issuer Free Writing Prospectus.

7. Representations and Agreements to Survive Delivery. All representations, warranties, and agreements of the Company and the Selling Stockholders herein or in certificates delivered pursuant hereto, including but not limited to the agreements of the Underwriter, the Company and the Selling Stockholders contained in Section 6 hereof, shall remain operative and in full force and effect regardless of any investigation made by or on behalf of the Underwriter or any controlling person thereof, or the Company or any of its officers, directors, or controlling persons, or any Selling Stockholders or any controlling person thereof, and shall survive delivery of, and payment for, the Securities to and by the Underwriter hereunder.

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8. Termination of this Agreement.

(a) You, as Underwriter, shall have the right to terminate this Agreement by giving notice to the Company and the Selling Stockholders as hereinafter specified at any time at or prior to the Closing Date, if (i) the Company or the Selling Stockholders shall have failed, refused or been unable, at or prior to the Closing Date, to perform any agreement on its or their part to be performed hereunder, (ii) any condition of the Underwriter’s obligations hereunder is not fulfilled, (iii) trading in the Company’s Common Stock shall have been suspended by the Commission or the Nasdaq Global Market or trading in securities generally on the Nasdaq Global Market, New York Stock Exchange or the American Stock Exchange shall have been suspended, (iv) minimum or maximum prices for trading shall have been fixed, or maximum ranges for prices for securities shall have been required, on the Nasdaq Global Market, New York Stock Exchange or the American Stock Exchange, by such Exchange or by order of the Commission or any other governmental authority having jurisdiction, (v) a banking moratorium shall have been declared by federal or state authorities, or (vi) there shall have occurred any attack on, outbreak or escalation of hostilities or act of terrorism involving the United States, any declaration by the United States of a national emergency or war, any change in financial markets, any substantial change or development involving a prospective substantial change in United States or international political, financial or economic conditions, or any other calamity or crisis that, in your judgment, is material and adverse and makes it impractical or inadvisable to proceed with the completion of the sale of and payment for the Securities. Any such termination shall be without liability of any party to any other party except that the provisions of Section 4(a)(viii), Section 4(b)(ii), Section 4(b)(viii) and Section 6 hereof shall at all times be effective and shall survive such termination.

(b) If you elect to terminate this Agreement as provided in this Section, the Company and the Selling Stockholders, shall be notified promptly by you by telephone, confirmed by letter.

9. Default by the Selling Stockholders. If one of the Selling Stockholders shall fail at the Closing Date to sell and deliver the number of Securities which such Selling Stockholder or Selling Stockholders are obligated to sell hereunder, then you may at your option, by notice from you to the Company and the non-defaulting Selling Stockholder, either (a) terminate this Agreement without any liability on your part or, except as provided in Sections 4(a)(viii), 4(b)(ii) and 4(b)(viii) hereof, any non-defaulting party or (b) elect to purchase the Securities which the non-defaulting Selling Stockholder has agreed to sell hereunder.

In the event of a default by any Selling Stockholder as referred to in this Section, you shall have the right to postpone the Closing Date for a period not exceeding seven days in order to effect any required changes in the Registration Statement, in the Time of Sale Disclosure Package or in the Prospectus or in any other documents or arrangements.

No action taken pursuant to this Section shall relieve the Company or any Selling Stockholders so defaulting from liability, if any, in respect of such default.

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10. Notices. Except as otherwise provided herein, all communications hereunder shall be in writing and, if to the Underwriter, shall be mailed, delivered or telecopied to the Underwriter c/o Piper Jaffray & Co., U.S. Bancorp Center, 800 Nicollet Mall, Minneapolis, Minnesota 55402, Attention: General Counsel (telecopy no. (612)  ###-###-####); if to any of the Selling Stockholders, c/o Lowell D. Ness, Orrick, Herrington & Sutcliffe LLP, 1000 Marsh Road, Menlo Park California (telecopy no. (650)  ###-###-####), or in each case to such other address as the person to be notified may have requested in writing. Any party to this Agreement may change such address for notices by sending to the parties to this Agreement written notice of a new address for such purpose.

11. Persons Entitled to Benefit of Agreement. This Agreement shall inure to the benefit of and be binding upon the parties hereto and their respective successors and assigns and the controlling persons, officers and directors referred to in Section 6. Nothing in this Agreement is intended or shall be construed to give to any other person, firm or corporation any legal or equitable remedy or claim under or in respect of this Agreement or any provision herein contained. The term “successors and assigns” as herein used shall not include any purchaser, as such purchaser, of any of the Securities from any of the Underwriter.

12. Absence of Fiduciary Relationship. The Company and each Selling Stockholder acknowledge and agree that: (a) the Underwriter has been retained solely to act as an underwriter in connection with the sale of the Securities and that no fiduciary, advisory or agency relationship between the Company or any Selling Stockholder and the Underwriter have been created in respect of any of the transactions contemplated by this Agreement, irrespective of whether the Underwriter has advised or is advising the Company or any Selling Stockholder on other matters; (b) the price and other terms of the Securities set forth in this Agreement were established by the Company and Selling Stockholders following discussions and arms-length negotiations with the Underwriter and the Company and the Selling Stockholders are capable of evaluating and understanding and understand and accept the terms, risks and conditions of the transactions contemplated by this Agreement; (c) it has been advised that the Underwriter and its affiliates are engaged in a broad range of transactions which may involve interests that differ from those of the Company and each Selling Stockholder and that the Underwriter has no obligation to disclose such interest and transactions to the Company by virtue of any fiduciary, advisory or agency relationship; (d) it, he or she has been advised that the Underwriter is acting, in respect of the transactions contemplated by this Agreement, solely for the benefit of the Underwriter, and not on behalf of the Company; (e) it waives to the fullest extent permitted by law, any claims it may have against the Underwriter for breach of fiduciary duty or alleged breach of fiduciary duty in respect of any of the transactions contemplated by this Agreement and agrees that the Underwriter shall have no liability (whether direct or indirect) to the Company or any Selling Stockholder in respect of such a fiduciary duty claim on behalf of or in right of the Company, including stockholders, employees or creditors of the Company or any Selling Stockholder.

13. Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of New York.

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14. Counterparts. This Agreement may be executed in one or more counterparts and, if executed in more than one counterpart, the executed counterparts shall each be deemed to be an original and all such counterparts shall together constitute one and the same instrument.

[Signature Page Follows]

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Please sign and return to the Company the enclosed duplicates of this letter whereupon this letter will become a binding agreement between the Company, the Selling Stockholders and the Underwriter in accordance with its terms.

SCHEDULE I

Selling Stockholders

SCHEDULE II

Issuer General Free Writing Prospectuses

Issuer Free Writing Prospectus dated February 15, 2007 filed with the Commission on

February 15, 2007

SCHEDULE III

Pricing Information Annex

SCHEDULE IV

Premier Devices, A Sirenza Company

Premier Devices Germany GmbH

aka Premier Devices (Shanghai) Co., Ltd.