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Field Effect Transistors (FET)

Q1:

How will a D-MOSFET input impedance change with signal frequency?

A As frequency increases input impedance increases.

B As frequency increases input impedance is constant.

C As frequency decreases input impedance increases.

D As frequency decreases input impedance is constant.

ANS:C - As frequency decreases input impedance increases.

We know that MOSFET is like a capacitor. And we know the impedance of capacitor = 1/2pifC. Inversely proportional.



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