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ELECTRICAL ENGINEERING DEPARTMENT
California Polytechnic State University
EE 361
Operational Amplifier (OpAmp) Circuits Part 1
Prelab 4
Voltage Follower, NonInverting Amplifier &
Inverting Amplifier
1.
Prove the closedloop gain (V
o
/ V
i
) for the opamp circuit below equals 1.
+12V
12V
+

V+
V
V
O
V
1
2.
Derive the closedloop gain (V
o
/ V
1
) for the opamp circuit below.
Also, can this opamp circuit “attenuate” a signal? Why or why not?
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3.
The opamp circuit below is an inverting amplifier. Sketch V
o
if R
A
= 1KΩ
,
R
B
= 10KΩ and V
1
= cos (628t) Volts.
Be certain to label, with numerical values, peak
voltage and period.