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If the transconductance of M1 is 5S, voltage gain for the following degenerated CS stage is _____

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If the transconductance of M1 is 5S, voltage gain for the following degenerated CS stage is _____

(a) 2.45

(b) 1.25

(c) 1.45

(d) 2.25

This question was posed to me during an interview.

My query is from MOSFET Amplifier with CS Configuration topic in section FET Amplifiers of Analog Circuits

1 Answer

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Best answer
Right option is (b) 1.25

Best explanation: The voltage gain for a degenerated CS stage is \(\frac{-Rd}{(\frac{1}{gm} + Rs)}\). Hence, after putting the values, we get 5/4 and hence the answer becomes 1.25. Rd is the total resistance connected to the drain of the M1 while Rs is the total resistance connected to the source of the M1.

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