The common- mode gain, ACM, of an op- amp with AOL = 200,000 and a CMRR of 80 dB is
A)10
B)40
C)80
D)20

Name: The common- mode gain, ACM, of an op- amp with AOL = 200,000 and a CMRR of 80 dB is A)10 B)40 C)80 D)20
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Question

Quizplus · Accepted Answer

The common-mode rejection ratio (CMRR) is given in decibels (dB) and is defined as 20*log10(AOL/ACM). Given CMRR = 80 dB and AOL = 200,000, we can solve for ACM: 80 = 20*log10(200,000/ACM). Solving this gives ACM = 20.

The Common- Mode Gain, ACM, of an Op- Amp with AOL