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Analog Electronics - Engineering

Q1:

If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is

A 23 dB

B 25 dB

C 46 dB

D 50 dB

ANS:C - 46 dB

We know that CMMR = 20 log (CMMR) = 20 log Ad - 20 log Ac = 48 - 2 46 dB.