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How do we compute the base impedance of a simplified CC amplifier?(a) β × (Re – re‘)(b) β × (Re + re‘)(c) RB || β × (Re – re‘)(d) RB || β × (Re + re‘)I had been asked this question in class test.My question comes from Simplified Calculations for the CC Configuration in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

The correct answer is (b) β × (Re + re‘)

Easy explanation: The base impedance of a SIMPLIFIED COMMON collector (CC) AMPLIFIER can be expressed in terms CIRCUIT resistor values. The base impedance is β × (Re + re‘) . Where β is the transistor amplifiers current gain, Re is the equivalent emitter resistance and re‘ is the alternating current resistance of the emitter-base diode.



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