Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 216.00

-0.7%

Dec 4 3:59 PM EST

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To: Yousef who wrote (75566)	3/26/2002 12:38:51 AM
From: hmaly	Read Replies (1) of 275872

Yousef Re...Yield = [[1 - e^-AD]/AD]^2 ... A = chip area in cm^2 ... D = defect density in defects/cm^2<<<<< Thanks for the post. I have a couple of questions. From previous discussions, I had assumed "defect density" meant the number of defects expected in a area of silicon before processing, which would of itself destroy a chip. Your formula for BE also includes a multiplier of n for the number of layers, but the MUR formula doesn't. Why? What determines defect density. The no. of bad chips, or the defects one can expect in silicon? If the defect density is compiled by totaling bad die/cm^2, are all processing errors called defect densities.

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