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Chapter 4: Operational Amplifiers Problem 4.FE-1
SOLUTION:
The correct answer is c.
)2(12
)4(4
22
k
R
k
RVo
VVo 3
)(61
)(13 22 RmRm
3)(6
52Rm
kR 6.32
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Chapter 4: Operational Amplifiers Problem 4.FE-2
SOLUTION:
k6
k12
V3
k36
oV-
+
k6
k12
V1
V2
k18
-
+
1V
The correct answer is b.
Vk
k
k
kV 5.4
12
181)4(
6
1821
k
k
k
kVV
12
363
6
3610
k
k
k
kV
12
363
6
365.40
VV 180
Chapter 4: Introduction to Operational Amplifiers Problem 4FE-2
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Chapter 4: Operational Amplifiers Problem 4.FE-3
SOLUTION:
3
4
V2
V6
2
oV-
+
fi
0i
The correct answer is a.
AR
V
R
Vi f 5.2
42
36
2
2
1
1
)2)(5.2(0 ff RiV
VV 50
Chapter 4: Introduction to Operational Amplifiers Problem 4FE-3
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Chapter 4: Operational Amplifiers Problem 4.FE-4
SOLUTION:
The correct answer is d.
The op-amp is a noninverting op-amp.
1
1R
RA f
1)1( RAR f
kkR f 2455)150(
Chapter 4: Introduction to Operational Amplifiers Problem 4FE-4
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Chapter 4: Operational Amplifiers Problem 4.FE-5
SOLUTION:
k2
k8
+
-
kR 61
kR 22
kR 13
V5
oV
The correct answer is c.
The 8k and 2k resistors make up a noninverting op-amp.
Vk
kV 255
2
811
Use nodal analysis at node A:
02
25
13 k
V
R
VV
R
V oioo
Chapter 4: Introduction to Operational Amplifiers Problem 4FE-5
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Problem 4.FE-5 Chapter 4: Operational Amplifiers
02
25
6
5
1 k
V
k
V
k
V ooo
075356 ooo VVV
8010 oV
VVo 8
Chapter 4: Introduction to Operational Amplifiers Problem 4FE-5
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