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What is the value of overall voltage gain in the hybrid-pi CE transistor model while considering RS ?

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What is the value of overall voltage gain in the hybrid-pi CE transistor model while considering RS ?

(a) VB / VS

(b) VC / VS

(c) VB × VS

(d) VC × VS

I have been asked this question by my college professor while I was bunking the class.

Query is from The Hybrid PI CE Transistor Model topic in section High Frequency Transistor of Electronic Devices & Circuits

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Correct choice is (a) VB / VS

To elaborate: The overall voltage gain in a simplified common emitter hybrid model while considering RS is calculated as ratio of base voltage over the applied external voltage. It is expressed as VB / VS . Where, VS is the external applied voltage on the amplifier.

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