Answer Posted / upchar kumar kurmi

cmrr stands for common mode rejection ratio and it is ratio
of defferential mode gain to common mode gain.The value for
cmrr is ideally infinity. It is used to reject interference
b/w both of measurement terminals of any instrument(like
opamp).It means it is reduces nopise.

cmrr=Ad/Ac;
cmrr=log[base10(Ad/Ac)];

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