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Yield Optimization

Question asked by juan-carlos.perezambrojo@thalesaleniaspace.com on Mar 4, 2009
Hi all,

how the yield optimizer is working so that I get a FinalYield that is worse than the InitialYield?

In a band pass filter made with MCFIL elements (parallel coupled lines)with tolerances on widths, and spacing, I run a yield optimization.
After optimization has finished, I got a FinalYield result of 74.5% while the InitialYield was 92%.
If I included also lengths and Er as statistical variables, the result is even worst.

Please explain this.  

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