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How do we compute the output impedance of a simplified CC amplifier?(a) RE || (re‘ – (R1 || R2) / (β + 1))(b) RE || (re‘ – (R1 || R2) / (β – 1))(c) RE || (re‘ + (R1 || R2) / (β + 1))(d) RE || (re‘ + (R1 || R2) / (β – 1))This question was addressed to me by my school teacher while I was bunking the class.This interesting question is from Simplified Calculations for the CC Configuration in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

Correct choice is (c) RE || (re‘ + (R1 || R2) / (β + 1))

Easiest explanation: The output IMPEDANCE of a simplified common collector (CC) AMPLIFIER can be expressed in terms circuit resistor values. The base impedance is RE || (re‘ + (R1 || R2) / (β + 1)) . 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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