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What is the value power gain in the hybrid-pi CE transistor model?

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What is the value power gain in the hybrid-pi CE transistor model?

(a) AV – AI

(b) AV + AI

(c) AV × AI

(d) AV / AI

The question was posed to me at a job interview.

The above asked question is from The Hybrid PI CE Transistor Model in portion High Frequency Transistor of Electronic Devices & Circuits

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Correct answer is (c) AV × AI

To explain I would say: The power gain in a simplified common emitter hybrid model is calculated as the product of voltage gain and power gain. It is expressed as AV × AI . It can also be further simplified as AI^2 × RL / Ri , where RL is load resistance and Ri  is input resistance.

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