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Find the transconductance of the network given below, provided that gm1 = 30mΩ^-1. VT = 25mV, VBias > 4V.

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Find the transconductance of the network given below, provided that gm1 = 30mΩ^-1. VT = 25mV, VBias > 4V.

(a) 30mΩ^-1

(b) 10mΩ^-1

(c) 1mΩ^-1

(d) 20mΩ^-1

This question was addressed to me during an online interview.

Query is from Cascade and Darlington Amplifier in portion General and Feedback Amplifiers of Analog Circuits

1 Answer

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Correct choice is (a) 30mΩ^-1

Best explanation: For a MOSFET cascode amplifier, the net transconductance in the above network shown is equal to the transconductance of MOSFET M1 that is equal to 30mΩ^-1.

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