Emitter Follower
Following points are to be noted here:
1) As the output is taken the emitter resistance Re and the voltage variation across base emitter junction (input) follow the emitter, the circuit is this called emitter follower.
2) It is also called common collector amplifier, because the transistor collector is at a.c. ground and common between input and output.
3) Here the output voltage Vo is taken across Re and is returned to input, so the negative feedback factor = 1.
4) The input signal voltage to the transistor Vi is equal to the difference between the externally applied input voltage Vs and the output voltage Vo, i.e Vi = Vs - Vo. Hence the feedback is negative.
5) Since input impedance is high and output impedance is low, so it is an ideal circuit for impedance matching.
Voltage gain without feedback and with feedback is given.
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Emitter Follower | Voltage Gain | PART 2
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