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Yield Simulation for Integrated Circuits (Paperback, Softcover reprint of hardcover 1st ed. 1987)
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Yield Simulation for Integrated Circuits (Paperback, Softcover reprint of hardcover 1st ed. 1987)
Series: The Springer International Series in Engineering and Computer Science, 33
Expected to ship within 10 - 15 working days
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In the summer of 1981 I was asked to consider the possibility of
manufacturing a 600,000 transistor microprocessor in 1985. It was
clear that the technology would only be capable of manufacturing
100,000-200,000 transistor chips with acceptable yields. The
control store ROM occupied approximately half of the chip area, so
I considered adding spare rows and columns to increase ROM yield.
Laser-programmed polysilicon fuses would be used to switch between
good and bad circuits. Since only half the chip area would have
redundancy, I was concerned that the increase in yield would not
outweigh the increased costs of testing and redundancy programming.
The fabrication technology did not yet exist, so I was unable to
experimentally verify the benefits of redundancy. When the
technology did become available, it would be too late in the
development schedule to spend time running test chips. The yield
analysis had to be done analytically or by simulation. Analytic
yield analysis techniques did not offer sufficient accuracy for
dealing with complex structures. The simulation techniques then
available were very labor-intensive and seemed more suitable for
redundant memories and other very regular structures [Stapper 80J.
I wanted a simulator that would allow me to evaluate the yield of
arbitrary redundant layouts, hence I termed such a simulator a
layout or yield simulator. Since I was unable to convince anyone to
build such a simulator for me, I embarked on the research myself.
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