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Renesas Electronics America - Knowledgebase

What is Common emitter circuit?

Latest Updated:02/01/2006


Common emitter circuit


In a common emitter circuit, when the emitter is connected to a common ground, the base acts as input, and the collector is connected to load resistor, the output can be got from the collector. Since a transistor is a current amplifying element, an output voltage of VO = RL × IC is obtained when the transistor is operated as a voltage amplifier.
This is one of the most commonly used circuits, and the input impedance is also relatively high and the I/O phase is inverted.
The key to design is how to select the operating bias point and load resistance.

Related items
Common collector circuit/Emitter follower circuit
Common base circuit

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