In a differential amplifier the differential voltage gain is 500 and the common mode voltage gain is 0.5. The CMRR in dB is (a) 80 (b) 60 (c) 30 (d) 20
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Ad - differential voltage gain.

Acm- common mode voltage gain

CMRR - common mode rejection ratio

 CMRR = 20log(Ad/Acm) = 60 dB
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