In the following C.S. stage shown below, what is the transconductance?(a) \(\frac{1}{2}\)µnCox*(W/L)(V1-Vth)(b) 3µnCox*(W/L)(V1-Vth)(c) µnCox*(W/L)(V1-Vth)(d) 2µnCox*(W/L)(V1-Vth)The question was asked in an interview for internship.This intriguing question originated from MOSFET Amplifier with CS Configuration in portion FET Amplifiers of Analog Circuits

In the following C.S. stage shown below, what is the transconductance?

1.	In the following C.S. stage shown below, what is the transconductance?(a) \(\frac{1}{2}\)µnCox(W/L)(V1-Vth)(b) 3µnCox(W/L)(V1-Vth)(c) µnCox(W/L)(V1-Vth)(d) 2µnCox(W/L)(V1-Vth)The question was asked in an interview for internship.This intriguing question originated from MOSFET Amplifier with CS Configuration in portion FET Amplifiers of Analog Circuits
Answer» Correct choice is (a) \(\frac{1}{2}\)µnCox(W/L)(V1-Vth) To elaborate: The transconductance is the ratio of a small CHANGE in the output CURRENT DUE to a small change in the input voltage. By differentiating the equation relating the current to the input voltage of a MOSFET with RESPECT to the input voltage, we’ll get \(\frac{1}{2}\)µnCox(W/L)(V1-Vth).

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