Exhibit 12.1

Cadence Design Systems, Inc
Ratio of earnings to fixed charges
$ in thousands

	Six months ended			(FY 2006)			(FY 2005)			(FY 2004)			(FY 2003)			(FY 2002)
	June 30, 2007			December 30, 2006			December 31, 2005			January 1, 2005			January 3, 2004			December 28, 2002
Earnings
Income (loss) before income taxes	$	147,794		$	241,878		$	128,483		$	86,437		$	(30,565	)	$	144,020
Earnings (losses) in equity interests		(1,720	)		(1,200	)		(6,489	)		(16,900	)		(10,875	)		(9,395	)
Fixed charges		12,293			22,517			15,107			14,731			12,783			10,570
Net ‘Earnings’ as defined	$	161,807		$	265,595		$	150,079		$	118,068		$	(6,907	)	$	163,985
Fixed charges
Total operating lease expenses	$	17,307		$	30,506		$	28,982		$	25,600		$	23,343		$	23,300
Interest component of operating lease expense (deemed to be 1/3 of op. lease expense)		5,769			10,169			9,661			8,533			7,781			7,767
Interest expense		6,524			12,348			5,446			6,198			5,002			2,803
Total Fixed charges	$	12,293		$	22,517		$	15,107		$	14,731		$	12,783		$	10,570
Earnings to fixed charges ratio		13.2			11.8			9.9			8.0			—			15.5
Earnings excess (deficiency)	$	149,514		$	243,078		$	134,972		$	103,337		$	(19,690	)	$	153,415