EXHIBIT 23.1

 

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

 

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 16, 2009, relating to the consolidated financial statements and financial statement schedule of PDF Solutions, Inc. and subsidiaries (the “Company”) (which report expresses an unqualified opinion and includes an explanatory paragraph regarding the adoption of Emerging Issues Task Force Issue No. 06-02, Accounting for Sabbatical Leave and Other Similar Benefits Pursuant to FASB Statement No. 43 and Financial Accounting Standards Board Interpretation No. 48, Accounting for Uncertainty in Income Taxes—an interpretation of FASB Statement No. 109), and our report dated March 16, 2009 relating to the effectiveness of the Company’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of the Company for the year ended December 31, 2008.

 

 

/s/ DELOITTE & TOUCHE LLP
San Jose, California
May 11, 2009