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Politics : Formerly About Advanced Micro Devices
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To: Bill Jackson who wrote (41340)11/12/1998 11:39:00 PM
From: Elmer  Read Replies (2) of 1571910
 
Re: "Elmer, I would think yields in the 70% area are very good and hard to achieve. "

Actually I know of devices that yield in the high 90% range because they are such small die. You can't calibrate on a percent number because it is much more complex than that. Paul or Yousef would be better at explaining this than I, but in short, a larger die will yield lower percentages with the same defect density as a smaller die. 50% yield may be extremely good for a very large die yet only 90% may be poor for a small die. There are some complex formulas for predicting yield based on die area and defect density for a given process. There is reason to believe that Intel runs at a lower defect density than anyone else in the industry. I am not a process kind a guy so I will defer to experts. My expertise lies elsewhere.

Paul or Yousef, can you expand on this? Maxwell, please don't waste our time.

EP
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