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a
ECE 137 A
MidTerm Exam
February 13, 2006
Do not open exam until instructed to.
Closed book: Crib sheet and 1 page personal notes permitted
There are 2 problems on this exam, and your have 50 minutes.
Use
any and all reasonable approximations
(5% accuracy is fine. ) ,
AFTER STATING
and approximately Justifying them.
Name:
_______________________
Problem
Points Received
Points Possible
1a
7
1b
7
1c
6
1d
15
1e
15
1f
6
1g
14
2a
12
2b
13
2c
5
total
100
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a
Problem 1, 70 points
You will be working on the circuit below:
V
gen
R
gen
R
b1
R
ee
R
c1
R
c2
Q
2
Q
1
R
L2
R
L1
V
out+
V
out
V
cc
V
ee
V
in+
C
1
C
2
Q1
and Q2:
β
=200,
A
V
=infinity V
+Vcc= +5 volts.
Vee= 5 volts
Rgen=500 Ohm
RL1=RL2=2000 Ohm
Rb1=1000 Ohm
Ree= ???
Rc1= ???
Rc2= ???
C1 and
C2 are very big and have negligible AC impedance.
a
Part a, 7 points
DC bias.
Q1 is to be biased with 3
mA emitter current.
Q2 is to be biased with 3 mA emitter current.
The DC collector voltages of Q1 and Q2 are both
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This note was uploaded on 08/06/2008 for the course ECE 137AB taught by Professor Rodwell during the Winter '08 term at UCSB.
 Winter '08
 RODWELL

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