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How do we compute the input impedance of a simplified CC amplifier?(a) β × (Re – re‘)(b) β × (Re + re‘)(c) RB || β × (Re – re‘)(d) RB || β × (Re + re‘)The question was asked in an online interview.This interesting question is from Simplified Calculations for the CC Configuration in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

Correct choice is (d) RB || β × (Re + re‘)

To explain I would say: The INPUT impedance of a simplified common collector (CC) amplifier can be expressed in TERMS circuit RESISTOR values. The base impedance is RB || β × (Re + re‘) . Where β is the transistor amplifiers current gain, Reis the equivalent emitter resistance, RB is the equivalent base resistance and re‘ is the alternating current resistance of the emitter-base diode.



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