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What is the value of overall voltage gain in the CE short circuit current frequency response model while considering RS?

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What is the value of overall voltage gain in the CE short circuit current frequency response model while considering RS?

(a) VB / VS

(b) VC / VS

(c) VB × VS

(d) VC × VS

I had been asked this question during a job interview.

My question is taken from The CE Short Circuit Current Frequency Response in portion High Frequency Transistor of Electronic Devices & Circuits

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Correct answer is (a) VB / VS

Explanation: 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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