dog1
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Thanks very much for all your answers.
Geoffrey_Coram, I think pixel is indeed large, often on the order of serveral um. The floating diffusion, however, which is related to the gain of a pixel, is normally smaller. It is not too much largerer from a well capacitor. That's why I was guessing that it should not be orders of magnitude smaller than normal device mismatch. I could be wrong. though. I also noticed that in Tako's reply, 1 sigma can indeed goes to 0.X% for Ids. Maybe this indicates that for um order size device 0.X% order mismatch is normal.
Tako, this is very helpful. Although I still don't understand how PRNU is normally so small, I have confidence that I am comparing apple to apple (local mismatch to local mismatch). I will, as you suggusted, try to find answers from some fab staffs. Maybe they have relavent image sensor knowledge to clear my confusion.
Thanks again.
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