Question

For a FET, graph is drawn by taking voltage VGS  in X axis and drain current in Y axis, if the value of X changes from 10 to 20 results in change in value of Y axis from 2 to 3. What is the value of trans conductance?

(a) 1

(b) 2

(c) 0.1

(d) 0.01

I have been asked this question during an online exam.

My doubt stems from The FET Small-Signal Model in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

Correct option is (c) 0.1

For explanation: Trans-conductance= change in drain current/ change in gate to source voltage

trans conductance=3-2/20-10=1/10

trans conductance=0.1.