COMMON COLLECTOR CONFIGURATION OF A TRANSISTOR
In this configuration the input is applied between the base and the collector and the output is taken from the collector and the emitter. Here the collector is common to both the input and the output circuits as shown in Fig.
Common Collector Transistor Circuit
In common collector configuration the input current is the base current IB and the output current is the emitter current IE. The ratio of change in emitter current to the change in the base current is called current amplification factor.
It is represented by
COMMON COLLECTOR CIRCUIT
A test circuit for determining the static characteristic of an NPN transistor is shown in Fig. In this circuit the collector is common to both the input and the output circuits. To measure the base and the emitter currents, milli ammeters are connected in series with the base and the emitter circuits. Voltmeters are connected across the input and the output circuits to measure VCE and VCB
Common Collector Input Characteristic Curve
1.This characteristic is practically identical to that of the common emitter circuit.
2.Its current gain characteristic for different values of VCE is also similar to that of a common emitter circuit.
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