The input impedance of a diff amp is half as high as a single common-emitter amplifier.

Question

Quizplus · Accepted Answer

The input impedance of a differential amplifier is typically higher than that of a single common-emitter amplifier because each input of the differential amplifier sees the parallel combination of two input impedances (from each transistor in the differential pair), effectively doubling the input impedance seen at each input compared to a single common-emitter amplifier.

The Input Impedance of a Diff Amp Is Half as High