NCEES Fundamentals of Engineering (FE) Electrical and Computer Practice Exam 2026 - Free FE Electrical and Computer Practice Questions and Study Guide

The Common-Mode Rejection Ratio (CMRR) is an important parameter for amplifiers, particularly in differential amplifiers, measuring their ability to reject common-mode signals, which typically include noise and interference that appear simultaneously on both inputs. A higher CMRR value signifies that the amplifier is better at ignoring these unwanted signals while amplifying the differential signal, resulting in improved performance with respect to noise rejection.

When CMRR is high, it indicates that the amplifier can effectively differentiate between the desired signal and any noise that impacts both input terminals similarly, thus delivering a cleaner output that is primarily influenced by the actual differential input. This capability is crucial in applications where noise rejection is paramount, such as in audio and instrumentation systems.

The other options do not accurately describe the implications of a higher CMRR. A lower acceptance of signal integrity suggests a lack of quality in the signal handling, a superior frequency response relates to the bandwidth characteristics rather than the ability to reject noise, and reduced signal amplification implies diminished performance, which contradicts the intended function of amplifying the desired signal.