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Operational Amplifiers - Technical MCQs

Q1:

A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms?

A 1.4 mV rms

B 650 mV rms

C 4.55 V rms

D 0.455 V rms

ANS:C - 4.55 V rms

CMRR = Ad/Acm.
3250 = Ad/0.2,
Ad = 650.

Ad = Vo/Vin.
Vo = 650x 7x 10^-3,
= 4.55V rms.