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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