1
EECS 215 Fall Term 2005 Midterm Exam II
N
a
m
e
:
Lecture Section
McAfee
Phillips
Rules:
1.
Monday, November 14, 2005, 6:00 to 7:30 PM nominal exam time.
DO NOT DISCUSS THIS EXAM WITH ANYONE PRIOR TO 6 PM November 15!!
2.
Closed Book, etc.
3.
1 Page (8.5”x11”, double sided) of notes allowed
4.
Calculators Needed and Allowed.
No devices with full alphanumeric keyboards are
permitted.
5.
Exam is given under the College of Engineering Honor Code principles and
practices.
6.
No communications of any kind are allowed. Use of cell phones, cameras, personal
data assistants, computers, or any other electronic devices, besides approved
calculators, will be treated as an Honor Code violation.
7.
Work to be done in Exam booklet.
Turn in all pages of the exam.
Do not unstaple the pages
.
8.
DO NOT WRITE ON THE BACK OF PAGES.
Work on backs of pages will NOT be graded.
9.
Show your work and
briefly
explain major steps to maximize partial credit.
(for example: i3=i1+i2, KCL at node A).
NO CREDIT WILL BE GIVEN IF NO WORK IS SHOWN.
10.
WRITE YOUR FINAL ANSWERS IN THE AREAS PROVIDED
This Exam Contains
4 problems over 21
pages
(including ample workspace).
Sign the College of Engineering Honor Code Below.
(NO credit will be given for the exam without a signed pledge):
I have neither given nor received aid on this examination.
Signed:______________________________________
Do not write below this line
************************************************************************
Problem 1 [ a
b
c
]
Problem 2 [ a
b
c
]
Problem 3 [ a
b
]
Problem 4 [ a
]
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Problem 1: OpAmp Circuit Analysis (25 points)
The opamp circuit shown has five (5) unknown node voltages ( V
O
, V
A
, V
B
, V
C
, V
D
).
V
O
–
+
R
F
= 50 K
Ω
R
3
20 K
Ω
R
4
40 K
Ω
V
S1
4 Volts
R
1
= 20 K
Ω
R
2
40 K
Ω
V
S3
= 4 Volts
I
S2
0.1 mA
I
S4
0.1 mA
V
B
V
A
V
D
V
C
I
O
Gnd = Reference Node
R
1
= 20 K
Ω
R
2
= 40 K
Ω
R
3
= 20 K
Ω
R
4
= 40 K
Ω
R
F
= 50 K
Ω
V
S1
= 4 Volts
I
S2
= 0.1 mA
V
S3
= 4 Volts
I
S4
= 0.1 mA
a)
Derive the numerical values for the node voltages (V
O
, V
A
, V
B
, V
C
, V
D
).
In the box/table
on page 2, enter the values for the node voltages.
Round each voltage answer to the
nearest millivolt (mV) and be careful to specify the
sign
of the voltage.
In the box/table
on page 3, CLEARLY indicate the equations you solved to derive the node voltage
values.
The
only
unknowns in the equations should be node voltages (V
O
, V
A
, V
B
, V
C
,
V
D
).
For each equation Circle
whether it is a
KVL
(voltage units) or a
KCL
(current
units) equation
.
Show your intermediate work on the following pages.
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 Winter '08
 Phillips
 Volt, Jaguar Racing

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