Answer Posted / raman chauhan

CMRR means common mode rejection ratio is the ratio of
diffrential gain to the common mode gain.
CMRR = Ad/Acm
where Ad = diffrential gain
Acm= common mode gain
its ideal value is infinite.
For high gain of opamp it should be infinite.
CMRR is represent in decibel.
decibel = 20log(Ad/Acm)

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