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ECE 423/523 – CMOS Integrated Circuits II

Problem Set #2

1. Using the small-signal equivalent model, find/derive the equivalent resistance for the

configurations shown below.

RG

RG

RS

RG

RG

RD

RG

RS

RS

2. Find the equivalent resistance for the following circuits using what you already know from

problem 1.

M3

RG2

M2

M2

M2

RG1

M1

M1

M3

RG

M1

RS

3. Bias the following circuits such that all transistors operate comfortably in saturation, then

“measure” (find) the Norton equivalent small-signal Gm and Rout by creating your own

“experiment” (simulation). Compare the results to the standard small-signal gain simulation.

Use .AC command (do not use .TF command) for all small-signal analysis. Use 0.18µm

CMOS models and 1.8V supply.

40/0.36

40/0.36

60/0.36

vin

20/0.18

vout

20/0.18

20/0.18

30/0.18

10/0.18

≈200μA

≈50μA

vin

10/0.18

1kΩ

vout

30/0.18

1kΩ

IIDEAL

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