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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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