How to size the transistors considering the mismatch?

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didibabawu

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Mismatch sometimes is a important error source of circuits such as differetial amplifier. In order to get better match,we need to use big transistors,but how can i kwon the size i use is big enough but not too big.

3x!
 

Hi
as I know it depends maximum error that you can neglect in your design and your technology specification.
regards
 

sometimes foundry provides mismatch report. perhaps if noise is thought about, the size is bigger.
 

how big is your transistors is a function of how much matching do you need(in terms of variance(sigma) parameters.
there are some formulas relating matching to some technology dependent factors such as AvT and transistors' W*L
 

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