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What is Common collector circuit/Emitter follower circuit?

Latest Updated:02/01/2006

Question:

Common collector circuit/Emitter follower circuit

Answer:

In a common collector (or emitter follower) circuit, a load resistor is connected between the emitter and common ground. By directly connecting the collector to the power supply, the collector becomes the AC common ground.
A common collector circuit, also known as an emitter follower circuit, has a high input impedance, low output impedance, and large current gain, so even if a large current flows to the load, the output voltage will hardly change. It is therefore ideal for driving a heavy load.

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