Question

Necessary condition to create a channel in n-channel enhancement MOSFET is ____________

(a) Vgs > Vt

(b) Vgs < Vt

(c) Vgs < 2Vt

(d) 2Vgs > Vt

I had been asked this question by my college professor while I was bunking the class.

The above asked question is from The Insulated-Gate FET(MOSFET) in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

The correct option is (a) Vgs > Vt

For explanation I would say: When gate to source voltage exceeds the threshold voltage, the source and substrate and drain and substrate forms a forward bias resulting in the formation of depletion region which acts as a channel.