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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
 

Read this paper.
Matching coefficients u can obtain from foundary.
 

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    didibabawu

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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
 

You can refer to Process Design Kit Manual.
 

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