EXHIBIT 99.1

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                       PURSUANT TO 18 U.S.C. SECTION 1350,
                       AS ADOPTED PURSUANT TO SECTION 906
                        OF THE SARBANES-OXLEY ACT OF 2002


      In connection with the Annual Report on Form 10-K for the fiscal year
ended December 28, 2002 of Cadence Design Systems, Inc. (the "Company") as filed
with the Securities and Exchange Commission on the date hereof (the "Report"),
I, H. Raymond Bingham, President and Chief Executive Officer of the Company,
certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that:

      1.    The Report fully complies with the requirements of Section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

      2.    The information contained in the Report fairly presents, in all
            material respects, the financial condition and results of operations
            of the Company.


                                         /s/ H. Raymond Bingham
                                         -----------------------------------
                                         H. Raymond Bingham
                                         President and Chief Executive Officer
                                         Date: March 14, 2003