Which term describes the ability of an amplifier to reject input signals common to both inputs?

The term that describes the ability of an amplifier to reject input signals that are common to both inputs is known as common mode rejection. Common mode rejection is a critical feature in differential amplifiers, which are designed to amplify the difference in voltage between two input signals while minimizing the effect of any signals that are present simultaneously on both inputs.

This concept is vital in applications such as EEG, where the goal is to obtain accurate readings of brain activity while eliminating noise or interference that could distort the signals being measured. A higher common mode rejection ratio (CMRR) indicates better performance in rejecting common signals, thereby improving the accuracy and clarity of the measurements.

The other terms do not accurately convey this specific property of amplifiers. Common mode gain refers more to the amplification of signals that are common to both inputs, which is the opposite of what is desired in this context. Signal rejection is a broader term and does not specifically address the context of common signals across both inputs. Input isolation generally refers to the isolation between the inputs and does not specifically imply the ability to reject common mode signals.