1) Consider the circuit shown below. We will see that this is a representation of Topology 4 of

common-mode feedback, when evaluated for common-mode signals. Assume that all

transistors are biased to have a | Veff|=0.1 V with λ = 0.25 V-¹. The transistors are sized such

that M1-M2 have W/L ratio of 0.5Kn; M3 has W/L ratio of Kp; M4-M5 have W/L ratio of 10kp;

M6-M7 has W/L ratio of 5Kn; and M8-M10 have W/L ratio of Kn. Calculate the following:

a. Loop gain

b. Beta for Vset/Vout

c. Closed-loop gain, Acl = Vout/Vset, including effects of the loop gain

d.

If lambda were doubled, calculate the percent change in loop gain and percent change

in closed-loop gain (i.e., (Xnew-Xold)/Xold x 100%).

e.

Explain why the percentage errors are so different between T and Acl.

MIO

M9

ходиа

Kn

Loke

M4

M5

Voino

Vort JMI

to

Mb 5 kn

M7

5kn

500μA

M2

0.5 км

M8

M3

Кр

Kn

100μA

Vset