Question

explain cc amplifier as a buffer

Answer 1

Called the common-collector configuration, its schematic diagram is shown in Figure below.



Common collector amplifier has collector common to both input and output.


It is called the common-collectorconfiguration because (ignoring the power supply battery) both the signal source and the load share the collector lead as a common connection point as in Figure below.



Common collector: Input is applied to base and collector. Output is from emitter-collector circuit.


It should be apparent that the load resistor in the common-collector amplifier circuit receives both the base and collector currents, being placed in series with the emitter. Since the emitter lead of a transistor is the one handling the most current (the sum of base and collector currents, since base and collector currents always mesh together to form the emitter current), it would be reasonable to presume that this amplifier will have a very large current gain. This presumption is indeed correct: the current gain for a common-collector amplifier is quite large, larger than any other transistor amplifier configuration. However, this is not necessarily what sets it apart from other amplifier designs.

Answer 2

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The common collector amplifier is one of the three basic BJT amplifiertopologies. In this circuit, the base of the transistor serves as an input, emitter as the output and the collector is grounded that is, common for both emitter and base. It is also called as an emitter follower. This configuration acts as a buffer.
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