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 reports relating to the financial statements of PDF Solutions, Inc. and management’s report on the effectiveness of internal control over financial reporting dated March 16, 2007 (which expresses an unqualified opinion and includes an explanatory paragraph relating to the adoption of Statement of Financial Accounting Standards No. 123 (revised 2004,Share-Based Payment)), appearing in the Annual Report on Form 10-K of PDF Solutions, Inc. for the year ended December 31, 2006.
/s/ DELOITTE & TOUCHE LLP
San Jose, California
March 28, 2007
San Jose, California
March 28, 2007