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Consider the circuit. Given hfe = 50, hie = 1200Ω. Find voltage gain.(a) – 278(b) -277.9(c) – 300(d) – 280This question was addressed to me in an online quiz.This interesting question is from Hybrid Equivalent Model topic in section Transistor Biasing and Low Frequencies of Analog Circuits

Answer»

Correct option is (a) – 278

The best I can EXPLAIN: Voltage GAIN = AV = -hfeRL’/hie

RL’ = 20k||10k = 6.67kΩ

AV = -50 * 6.67k/1.2k = -277.9 ≅ – 278.



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