Exhibit 99.3

FOURTH AMENDMENT

TO

LOAN AND SECURITY AGREEMENT

THISFOURTH AMENDMENTto Loan and Security
Agreement (this Amendment) is entered into this 14th day of February, 2007, by and between Silicon Valley Bank (Bank) and SIRF TECHNOLOGY, INC., a Delaware corporation (Borrower) whose address is 217 Devcon Drive,
San Jose, California 95112.

RECITALS

A.Bank and Borrower have entered into that certain Amended and Restated Loan and Security Agreement dated as of March 27, 2003, as amended by that certain Loan Modification Agreement by and between Bank
and Borrower dated as of February 2, 2004, by that certain Loan Modification by and between Bank and Borrower dated as of February 14, 2005 and as further amended by that certain Third Amendment to Loan and Security Agreement by and
between Bank and Borrower dated as of December 19, 2006 (as the same may from time to time be further amended, modified, supplemented or restated, the Loan Agreement).

B.Bank has extended credit to Borrower for the purposes permitted in the Loan Agreement.

C.Borrower has requested that Bank amend the Loan Agreement to (i) extend the Revolving Maturity Date and (ii) make certain other
revisions to the Loan Agreement as more fully set forth herein.

D.Bank has agreed to so amend certain provisions of the Loan
Agreement, but only to the extent, in accordance with the terms, subject to the conditions and in reliance upon the representations and warranties set forth below.

AGREEMENT

NOW, THEREFORE, in
consideration of the foregoing recitals and other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, and intending to be legally bound, the parties hereto agree as follows:

1. Definitions. Capitalized terms used but not defined in this Amendment shall have the meanings given to them in the Loan Agreement.

2. Amendments to Loan Agreement.

2.1 Section 2.3 (Interest Rate, Payments).The first sentence under Section 2.3(b) is hereby amended to read as follows:

(b) Payments. Interest due on the Committed Revolving Line is payable on the
14thof each month.





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2.2 Section 6.7 (Financial Covenants).Section 6.7 is amended in
its entirety and replaced with the following:

Borrower will maintain on the last day of each quarter:

(i) Tangible Net Worth. A Tangible Net Worth of at least $150,000,000 increasing by 50% of any new round of equity financing
raised by Borrower, provided, however, Bank may reset the Tangible Net Worth covenant each year based on Borrowers annual projections as submitted by Borrower to Bank on an annual basis.

2.3 Section 13 (Definitions). The following term and its respective definition set forth in
Section 13.1 is amended in its entirety and replaced with the following:

Revolving Maturity
Date is February 14, 2009.

3. Limitation of Amendments.

3.1 The amendments set forth in Section 2, above, are effective for the purposes set forth herein and shall be limited
precisely as written and shall not be deemed to (a) be a consent to any amendment, waiver or modification of any other term or condition of any Loan Document, or (b) otherwise prejudice any right or remedy which Bank may now have or may
have in the future under or in connection with any Loan Document.

3.2 This Amendment shall be construed in
connection with and as part of the Loan Documents and all terms, conditions, representations, warranties, covenants and agreements set forth in the Loan Documents, except as herein amended, are hereby ratified and confirmed and shall remain in full
force and effect.

4. Representations and Warranties. To induce Bank to enter into this Amendment, Borrower hereby represents
and warrants to Bank as follows:

4.1 Immediately after giving effect to this Amendment (a) the representations
and warranties contained in the Loan Documents are true, accurate and complete in all material respects as of the date hereof (except to the extent such representations and warranties relate to an earlier date, in which case they are true and
correct as of such date), and (b) no Event of Default has occurred and is continuing;

4.2 Borrower has the
power and authority to execute and deliver this Amendment and to perform its obligations under the Loan Agreement, as amended by this Amendment;

4.3 The organizational documents of Borrower delivered to Bank on March 27, 2003 remain true, accurate and complete and have not been amended, supplemented or restated and are and continue to be in full
force and effect;



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4.4 The execution and delivery by Borrower of this Amendment and the performance
by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, have been duly authorized;

4.5 The execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, do not and will not contravene (a) any law or regulation
binding on or affecting Borrower, (b) any contractual restriction with a Person binding on Borrower, (c) any order, judgment or decree of any court or other governmental or public body or authority, or subdivision thereof, binding on
Borrower, or (d) the organizational documents of Borrower;

4.6 The execution and delivery by Borrower of this
Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, do not require any order, consent, approval, license, authorization or validation of, or filing, recording or registration with, or
exemption by any governmental or public body or authority, or subdivision thereof, binding on either Borrower, except as already has been obtained or made; and

4.7This Amendment has been duly executed and delivered by Borrower and is the binding obligation of Borrower, enforceable against
Borrower in accordance with its terms, except as such enforceability may be limited by bankruptcy, insolvency, reorganization, liquidation, moratorium or other similar laws of general application and equitable principles relating to or affecting
creditors rights.

5. Integration. This Amendment and the Loan Documents represent the entire agreement about this
subject matter and supersede prior negotiations or agreements. All prior agreements, understandings, representations, warranties, and negotiations between the parties about the subject matter of this Amendment and the Loan Documents merge into this
Amendment and the Loan Documents.

6. Counterparts. This Amendment may be executed in any number of counterparts and all of
such counterparts taken together shall be deemed to constitute one and the same instrument.

7. Effectiveness. This Amendment
shall be deemed effective upon the due execution and delivery to Bank of this Amendment by each party hereto.

[Signature page follows.]



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IN WITNESS WHEREOF,the parties hereto have caused
this Amendment to be duly executed and delivered as of the date first written above.



|                    |  |                      |  |                       |  |        |  |                     
|------------------- |  | -------------------- |  | --------------------- |  | ------ |  | --------------------
|BANK                |  |                      |  | BORROWER             
|                    |  |                     
|Silicon Valley Bank |  |                      |  | Sirf Technology, Inc.
|                    |  |                      |  |                      
|By:                 |  | /s/ Nick Tsiagkas    |  |                       |  | By:    |  | /s/ Dennis Bencala  
|Name:               |  | Nick Tsiagkas        |  |                       |  | Name:  |  | Dennis Bencala      
|Title:              |  | Relationship Manager |  |                       |  | Title: |  | Corporate Controller