Amplifier Circuit The common emitter amplifier and emitter follower will be demonstrated using the same amplifier circuit. The main difference between the two will be where the output is taken.

By comparison the impedance of the base circuit on the common emitter amplifier with its resistor network is much higher.

The output impedance of an emitter follower is significantly lower than that of a common emitter amplifier, allowing it to drive much more demanding loads.

The system gain is – RC gm . The result is consistent with the common emitter circuit without a degeneration, namely, it is a forward circuit with a gain of – RC gm For larger values of Re , the ...