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What is the relation between Vb and Vin in the following circuit?

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What is the relation between Vb and Vin in the following circuit?

(a) Vb > Vin by Vth

(b) Vb = Vin

(c) Vb < Vin by Vth

(d) No relation

This question was posed to me in my homework.

Query is from MOSFET Amplifier with CG Configuration topic in section FET Amplifiers of Analog Circuits

1 Answer

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Right choice is (a) Vb > Vin by Vth

Easy explanation: To turn an NMOS on, we need to keep the voltage difference between the gate and the source greater than the threshold voltage. Hence, the gate potential should greater than the source potential by Vth.

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