How should be the gain of a CMFB circuit??

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rastro

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I would like to know how should be the gain of a CMFB circuit for an OTA, high or low? and Why?
If it's possible to reference the answer to a paper,it would be grandiose.
Thanks very much who can help me.
 

if the gain is high the error between the desired and obtained voltage of common mode will be less, that's good for having accuracy.
 

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