Question

In a p-channel E-MOSFET, the current becomes constant in saturation region. Which of the following condition depicts this?

(a) VDS = 2Vgs-Vt

(b) VDS > Vgs-Vt

(c) VDS ≤ Vgs-Vt

(d) VDS = Vgs

The question was asked in semester exam.

I want to ask this question from The Insulated-Gate FET(MOSFET) topic in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

Correct option is (c) VDS ≤ Vgs-Vt

Explanation: The p-channel E-MOSFET operates in the saturation region when VDS > Vgs-Vt, since we will be fixing the gate to source voltage and threshold is a system constant, whatever may be the value of VDS which is lesser than Vgs-Vt, the current remains the same.