- #1

CoolDude420

- 201

- 9

## Homework Statement

(From Razavi's Design of Analog CMOS Integrated Circuits - Chapter 6)

## Homework Equations

## The Attempt at a Solution

Not too sure about calculating the input impedance of this. Initially I thought that it would be the series combination of C1 and C2, since we are neglecting Cgs, so

But after I actually did it on paper, I got something like this,

Usually, I would try and use superposition for this but I don't see how that would work since Vx would dissapear. Honestly, I have no idea what to do now?