Berti
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Peter,
I think you should distinguish between local and distance mismatch. Unfortunatly, distance mismatch is typically not characterized in the DRM and there is also only very little literature available. However, you can try to find a publication which gives number for distance mismatch for a similar technology and compare it to the local mismatch data you have from your fab.
But when you have small (especially minimum length) devices, I think that the benefit of common centroid is only limited. Dummies on the other hand I think are important due to well-proximity effects, STI etc.
Cheers
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