The common-mode rejection ratio is usually defined as the ratio of the differential voltage gain to the common-mode voltage gain.

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Quizplus · Accepted Answer

The common-mode rejection ratio (CMRR) is indeed defined as the ratio of the differential voltage gain (the gain that the amplifier provides to a signal that appears in phase and with the same magnitude at both the positive and negative inputs) to the common-mode voltage gain (the gain that the amplifier provides to signals that appear simultaneously and with the same phase on both the positive and negative inputs).

The Common-Mode Rejection Ratio Is Usually Defined as the Ratio