A common-collector amplifier has a high input impedance compared to a common-emitter amplifier.

Question

Quizplus · Accepted Answer

The common-collector configuration has a high input impedance because the input is applied to the emitter, which is grounded through a low-resistance bypass capacitor. The common-emitter configuration has a lower input impedance because the input is applied to the base, which has a lower impedance due to the biasing resistor network.

A Common-Collector Amplifier Has a High Input Impedance Compared to a Common-Emitter