For the transistor shown below, parameters are V TH= 1V and K n =

For the transistor shown below, parameters are V TH= 1V and K n =
| For the transistor shown below, parameters are VTH=1V and Kn =1.25µA/V2. The Q-point (ID, VDS) is?

A.

B.

C.

D.

Please scroll down to see the correct answer and solution guide.

Right Answer is: D

SOLUTION

For dc analysis, we redraw the circuit as

Applying KVL in drain to source loop,

or

Again, applying KVL in drain to gate loop, we have

or

Assume that the transistor is in saturation, so we have


or

or


Now, for

we have,

Which is not possible.

Again, for A, we have

So,

Therefore, we conclude that

Thus, our assumption is not correct, and the MOSFET is in non-saturation.

The drain current for the region is given by

So,

Expressing the equation in quadratic form,

Solving the quadratic equation, we get

For  we have

Which is not possible.

Again, for , we have

and

So,

Thus, MOSFET is in non-saturation.

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