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Thread: Computer Architecture: Die Wafer Yield Question.

  1. #1 Computer Architecture: Die Wafer Yield Question. 
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    Oct 2009
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    The following is a question I have to do for homework. I am not sure what the professor is asking. Is he asking for the positive yield which would be found using the formula (1+ (unit area * die) /a)-a ? Or is he asking something else. I cannot seem to figure out why is is telling us that the yield is 100% or why he is providing the wafer size. Anyway here is the question.

    The Hypo processor chip is fabricated from a 300 mm diameter wafer that has a 100% yield. The die size is 400 mm2, the estimated defect rate is 0.25 defects/cm2, and α = 4. Calculate the mean number of good chips obtained from each wafer. Clearly show the calculations and answer below.


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