Given that CMRR is 100dB. Input common-mode voltage is 12 V. Differential voltage gain is 4000. Calculate output common-mode voltage.(a) 48V(b) 0.48V(c) 20V(d) 11VThis question was posed to me during an online interview.My question comes from Operational Amplifiers topic in chapter Op-amps and its Applications of Analog Circuits

Given that CMRR is 100dB. Input common-mode voltage is 12 V. Different

1.	Given that CMRR is 100dB. Input common-mode voltage is 12 V. Differential voltage gain is 4000. Calculate output common-mode voltage.(a) 48V(b) 0.48V(c) 20V(d) 11VThis question was posed to me during an online interview.My question comes from Operational Amplifiers topic in chapter Op-amps and its Applications of Analog Circuits
Answer» Right answer is (B) 0.48V Best explanation: CMRR = 20 LOG(AD/ACM) = 20 log(4000×12/Vocm) = 100 Log(48000/VOCM) = 5 48000/VOCM = 10^5 VOCM = 0.48V.

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