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In which of the following configuration is the input resistance (Ri) not equal to zero ideally?

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In which of the following configuration is the input resistance (Ri) not equal to zero ideally?

(a) Common source configuration

(b) Common source configuration with source resistance

(c) Common gate configuration

(d) Source follower configuration

I had been asked this question in a national level competition.

I'd like to ask this question from Basic MOSFET Amplifier Configurations in division MOS Field Effect Transistors (MOSFETs) of Electronic Devices & Circuits

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Best answer
The correct choice is (c) Common gate configuration

The best explanation: Refer to the circuit for the common gate configuration

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