M E 345
Spring 2008
Professor John M. Cimbala
Lecture 25
03/19/2008
Today, we will
:
•
Continue the example from last time, which we did not quite finish.
•
Continue reviewing the pdf module:
OpAmps (noninverting amps, active filters, and
clipping circuits; if time, also cover CMRR and GBP)
•
Do some more example problems – opamps
•
Discuss an additional item not in the pdf notes:
Input loading and the significance of
input impedance
Example from last time (continued)
Given
:
Two voltage input signals,
V
1
and
V
2
are to be combined as follows to produce
an output voltage:
( )
o1
2
43
VV
V
=+
.
To do
:
Design a circuit that will produce this output, using only opamps and resistors.
Assume that the only resistors you have are 20 k
Ω
.
Solution
: Last time we did a “brute force” circuit, needing 5 opamps and 16 resistors. Now
let’s design a more efficient circuit that will do the same job.
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Given
:
Consider the circuit shown.
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 Spring '08
 staff
 Alternating Current, Amplifier, Input impedance, The Circuit, power supply, Sine wave

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