EE 230
Homework Assignment 6
Spring 2010
Problem 1
Consider the basic noninverting feedback amplifier circuit where the
nominal dc gain is given by the expression
2
0
1
R
K=1+
R
.
a)
Assuming the gain of the op amp is given by
()
0A
1
A
A •BW
As=
s+BW
Show that the magnitude of the openloop gain and the closedloop gain are as
depicted in the figure shown.
That is, they both are firstorder lowpass, have dc gains
of A
0
and K
0
respectively, and that as frequencies enter the stopband, that they are
nearly coincident.
b) Show that there is very little difference in the closed loop response if the simpler
open loop gain expression
GB
s
where GB=A
0
BW
A
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View Full DocumentProblem 2
Determine the 3dB bandwidth of the following circuits if the op amp is the
National LMP 2231 biased with a single 5V dc power supply.
R
3
=20K
V
IN
V
OUT
R
F
=20K
R
1
=20K
R
2
=40K
.
Problem 3
Determine the 3dB bandwidth of the cascade of 4 identical noninverting
amplifiers and compare with that of a single noninverting amplifier if both structures are
to achieve the same gain.
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 Fall '08
 mina
 Amplifier, Operational Amplifier, Gainbandwidth product, strain gage, Gage

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