When a transistor is added to a circuit such that, input signal is provided parallel to its emitter-base junction and output is obtained from collector-emitter junction while emitter is common or grounded then such circuit is called common-emitter circuit. This circuit is the most popular method to use transistor as an amplifier.
In other words, “common-emitter circuit” is a circuit in which:
1. Emitter is grounded
2. Input signal is provided across base
3. And output signal is obtained across collector
A signal stage CE amplifier circuit is shown, in the figure, in which NPN transistor is used.
Base is ‘driven element’ in it (it means that base current plays the role of input)
Input current is provided through base-emitter circuit while, output signal is obtained through collector-emitter circuit.
Emitter base junction is forward biased with battery VB and collector-base junction is reverse-biased with battery VCC.
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