When a differential amplifier is not perfectly symmetrical?

When a differential amplifier is not perfectly symmetrical, it can lead to various issues such as increased common-mode gain, reduced common-mode rejection ratio (CMRR), and distortion in the output signal. This asymmetry may arise from mismatched components, variations in biasing, or temperature differences affecting transistor characteristics. As a result, the amplifier may have a higher susceptibility to noise and may not accurately amplify the differential input signal, compromising the overall performance and signal integrity.