POWER OF ATTORNEY


I, Geoffrey G. Ribar, hereby authorize Lip-Bu Tan, James J. Cowie or
Sharon Segev of Cadence Design Systems, Inc., a Delaware
corporation (the Company), to sign and file on my behalf the Initial
Statementof Beneficial Ownership of Securities on Form 3, Statements
of Changes in Beneficial Ownership on Forms 4 and 5, and any Amendments
 and applications thereto, to be filed with the Securities and Exchange
Commission pursuant to Section 16(a) of the Securities Act of 1934
relating to my beneficial ownership of securities in the Company.
The undersigned hereby grants
to each such attorney-in-fact full power and authority to do and perform
any and every act and thing whatsoever requisite, necessary, or proper
to be done in the exercise of any of the rights and powers herein granted,
as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact s substitute or substitutes,
shall lawfully do or cause to be done by virtue of this power of
attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing
attorney-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned s responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934. This authorization shall remain in effect until
I am no longer required to file forms under Section 16(a) with respect
to the Company s securities, unless earlier revoked in writing delivered to
the foregoing attorneys-in-fact.


/s/ Geoffrey G. Ribar				October 22, 2010
Geoffrey G. Ribar                                   Date


r Section 16(a) with respect
to the Company s securities, unless earlier revoked in writing delivered to
the foregoing attorneys-in-fact.


/s/ Geoffrey G. Ribar				Octo