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To: wanna_bmw who wrote (157393)1/30/2002 11:09:44 PM
From: Elmer  Respond to of 186894
 
That is pretty interesting. Can you please share the equation that you used to calculate defect density? Or is this just something you know from experience?

Actually defect density is an input to the yield formula. I simply used the 80mm2 die size and adjusted the defect density until I arrived at the projected yield you provided. I then used that same defect density number and readjusted the die size to 129mm2 and out comes the yield for Athlon. I'm sorry I can't share the yield model because it's proprietary but there must be some models out there in the public domain that you could use and fiddle with to arrive at the same answer. The real confidential information is not the formula but the actual defect density number the fab is running at. You can thank AMD for providing it.

EP