When a diff amp is amplifying the wanted signal and discriminating against the common-mode signal the CMRR is
A) high.
B) low.
C) less than 1.
D) equal to the common-mode voltage gain divided by the voltage gain.

Question

Quizplus · Accepted Answer

CMRR (Common-Mode Rejection Ratio) is a measure of how well a differential amplifier can reject the common-mode signal. A high CMRR implies that the differential amplifier can amplify the wanted signal while suppressing the common-mode signal. Therefore, when a diff amp is amplifying the wanted signal and discriminating against the common-mode signal, the CMRR is high.

When a Diff Amp Is Amplifying the Wanted Signal and Discriminating