POWER OF ATTORNEY


		KNOW ALL MEN BY THESE PRESENTS, that the
undersigned hereby constitutes and appoints Brian Beattie, Brian Cabrera,
 Stephen Buckhout and Aileen Sasao, each acting individually, as his true
 and lawful attorney-in-fact to:

(1)	execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer of Synopsys, Inc. (the "Company"), any
and all Forms 3, 4 and 5 required to be filed by the undersigned in
accordance with Section 16(a) of the Securities Exchange Act of
1934 and the rules thereunder;

(2)	do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and
execute any such Form 3, 4 or 5 and timely file such form with
the United States Securities and Exchange Commission and any
stock exchange or similar authority; and

(3)	take any other action of any type whatsoever in connection with
the foregoing that, in the opinion of such attorney-in-fact, may be
of benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by
attorney-in-fact on behalf of the undersigned, pursuant to this
Power of Attorney, shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in his
discretion.

		The undersigned hereby grants to such attorney-in-fact full power
and authority to do and perform all and
every act and thing whatsoever requisite,
necessary, and 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 his 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 no such attorney-in-fact, in serving in such capacity at the
request of the undersigned, is hereby assuming, nor is the Company hereby
assuming, any of the undersigned's responsibilities
 to comply with Section 16 of
the Securities Exchange Act of 1934.

	This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of, and transactions in,
securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorney-in fact.

		IN WITNESS WHEREOF, the undersigned has caused this
Power of Attorney to be executed as of this 11th day of September, 2006.


	/s/ Paul (Sheng-Chun) Lo
	Paul (Sheng-Chun) Lo