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EE/CE 3311 Electronic Circuits
Homework # 3
Assigned on 02/17/2010
Due on 02/24/2010
For all the problems, unless stated otherwise, assume that the bipolar transistor operates in the
forward active region.
Problem #1 (5 points)
Suppose the voltage-dependent current source of Fig. 1-1 is constructed with
K
= 20 mA/V.
What value of load resistance is necessary to achieve a voltage gain of 15?
Fig. 1-1.
Problem #2 (10 points)
Consider the ‘amplifier’ in Fig. 2-1. A resistance
R
S
is placed in series with the input voltage
source.
(a)
Determine
V
out
/
V
in
.
(b)
What happens if
r
in
and
K
are related:
r
in
=
a
/
x
and
K
=
bx
. Plot the voltage gain as a
function of
x
.
Fig. 2-1.

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Problem #3 (10 points)
In the circuit of Fig. 3-1, it is observed that the collector currents of
Q
1
and
Q
2
are equal if
V
BE1
–
V
BE2
= 20 mV. Determine the ratio of transistor cross-section areas if the other device
parameters are identical.
Fig. 3-1.

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