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

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

(a) VB / VS

(b) VC / VS

(c) VB × VS

(d) VC × VS

I have been asked this question in semester exam.

This question is from Simplified CE Hybrid Model in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Correct option is (a) VB / VS

To explain: 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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