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sol5 - (b If there are four memory blocks per chip the...

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MIT OpenCourseWare http://ocw.mit.edu 2.830J / 6.780J / ESD.63J Control of Manufacturing Processes (SMA 6303) Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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MIT 6.780J, 2008 Assignment 5 solutions Part 1 — Solutions removed due to copyright restrictions. Part 2 (a) If yield of individual amplifiers is 99.5%, the yield of a memory block with 256 amplifiers each of which must function is (0.995) 256 = 27.7%. This is the functional yield of chips containing one memory block each.
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Unformatted text preview: (b) If there are four memory blocks per chip, the functional yield is (0.277) 4 = 0.6%. (c) If the memory block can be reconfigured to function with 25 or fewer defective amplifiers, the yield is now: 25 ∑ 256 C k (0.995) 256 − k (0.005) k k = We can use a Poisson approximation to this binomial distribution to ease evaluation, where λ = 0.005 × 256 = 1.28. Then the yield is given by 25 ∑ exp( − λ ) k / k ! ≈ 1 k = 0...
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