In the following circuit, transistors and has following parameter

In the following circuit, transistors and has following parameter
| In the following circuit, transistors  and  has following parameters:

(Kn)1=(Kn)2 = 100 µA/V2

 

The voltages V1, V2, and V3 are respectively

A. 1 V, 1 V, 1.1 V

B. 1 V, 2 V, 1 V

C. 2 V, 1 V, 1.32 V

D. 1 V, 1 V, 1.32 V

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

Right Answer is: D

SOLUTION

For dc analysis, we draw the equivalent circuit as

In both MOSFETs, gate voltage is . Since, both MOSFETs are identical, se we

have

Applying KCL at node , we have

or

In , voltage at drain terminal is obtained as

 

Similarly, for , we obtain

Assume that MOSFET is in saturation, so we have

The drain current for saturation region is defined as

Substituting the given values,

or

or

or

Thus,

i.e. MOSFET in saturation (our assumption is true). Hence, the obtained value of  is valid, i.e.

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