UNIVERSITY OF CALIFORNIA
College of Engineering
Department of Electrical Engineering and Computer Sciences
EE 105
Prof. Salahuddin
Fall 2009
Homework Assignment #4
Due at the beginning of class on Friday, 9/29/09
Problem 1
[15 points]: Resistive Voltage Divider Biasing
Consider the circuit below, in which the BJT performance parameters are
β
= 100,
I
S
= 6
×
10
16
A, and
V
A
=
∞
.
Suppose the desired collector current (
I
C
) is 0.2 mA.
a)
What is the required value of
R
1
?
(Note: You should account for base current,)
b)
What is the “error” in
I
C
if
β
deviates from its nominal value by 5%?
(By what percentage does
I
C
change if
β
increases by 5%)?
c)
What is the “error” in
I
C
if
R
1
deviates from its nominal value by 5%?
(By what percentage does
I
C
change if
R
1
increases by 5%)?
Problem 2
[15 points]: Biasing with Emitter Degeneration
Consider the same circuit as in Problem 1, but with emitter degeneration.
(
β
= 100,
I
S
= 6
×
10
16
A,
V
A
=
∞
.)
a)
Determine the value of
R
1
required to achieve a collector current of 0.2 mA.
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 Fall '07
 KingLiu
 Input impedance, Electronic amplifier, Grid bias, Biasing, Common emitter

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