EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS

         We consent to the incorporation by reference in Registration Statements
No. 333-102509 and 333-66758 of PDF Solutions, Inc., on Form S-8 of our report
dated November 12, 2002, (which expresses an unqualified opinion and includes an
explanatory paragraph referring to the Company's ability to continue as a going
concern) on the consolidated financial statements of IDS Software Systems, Inc.
appearing in this current report on Form 8-K/A of PDF Solutions, Inc.

/s/ Ernst and Young LLP

Palo Alto, California
November 6, 2003