Homework 26
ECE201: Linear Circuit Analysis
Due in class: Wednesday, November 2, 2011
1.
For the ideal operation amplifier shown below, determine the following.
a.
What are the numerical values for
i
2
and
i

?
b.
In terms of the sources and resistances, what are the voltages at the inverting
V

and non
inverting
V
+
terminals of the ideal opamp?
c.
If
V
2
= 0V,
V
1
= 30,
R
1
= 2
, and
R
f
= 1
, find
V
out
.
d.
If
V
2
= 10V,
V
1
= 30,
R
1
= 2
, and
R
f
= 1
, find
V
out
.
e.
If
V
2
= 10V,
V
1
= 30,
R
1
= 2
, and
R
f
= (1/2)
, find
V
out
.
f.
If
V
2
= 10V,
V
1
= 30,
R
1
= 2
, and
R
f
= 10
, find
i
oa
.
g.
If
V
2
= 30V,
V
1
= 10,
R
1
= 2
, and
R
f
= 10
, find
i
oa
.
h.
Gain is defined as
V
out
/V
in
. What does
R
f
need to be such that the gain of the opamp has a
magnitude of 1000? Assume that
V
in
=
V
1
,
R
1
= 2
, and
V
2
= 0V.
i.
If
V
1
=
V
2
= 10V, then what is
V
out
and
i
oa
?
j.