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For an ideal voltage amplifier circuit, what should be the value of input resistance?

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For an ideal voltage amplifier circuit, what should be the value of input resistance?

(a) Zero

(b) Infinity

(c) Unity

(d) Unpredictable

I had been asked this question in a job interview.

My query is from Properties of Negative Feedback topic in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

1 Answer

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Correct option is (b) Infinity

To explain: Ideally the value of input resistance must be infinite while the value of output resistance must be zero in order to yield maximum amplified voltage gain.

But practically, it can be implied that the voltage must have large value of input resistance and small value of output resistance.

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