The ability of an amplifier to reject like signals is called?

The ability of an amplifier to reject like signals, particularly those signals that are common to both inputs, is termed common mode rejection. This characteristic is crucial in differential amplifiers, where the goal is to amplify the difference between two signals while minimizing the effect of noise or interference that may be present on both lines.

Common mode rejection is quantifiable through the common mode rejection ratio (CMRR), which measures how effectively the amplifier can suppress common mode signals relative to differential signals. A high CMRR indicates that the amplifier can significantly diminish unwanted signals, leading to clearer and more accurate output.

The other concepts listed, such as amplifier gain, phase reversal, and sensitivity, pertain to different aspects of amplifier function. Amplifier gain refers to how much the amplifier increases the amplitude of a signal. Phase reversal concerns the inversion of signal phase as it goes through an amplifier, while sensitivity refers to the smallest signal level that can be detected by the amplifier. Each of these concepts plays a distinct role in understanding amplifier operation, but they do not specifically describe the ability to reject common signals.