1
University of Massachusetts
Department of Electrical and Computer Engineering
ECE 323 Electronics I
Fall 2010
Problem Set 2:
Do problem 5.78 in Sedra and Smith
plus the problems below.
Problem 1:
In this problem assume that Beta is infinite and that V
be
=0.7V for all transistors.
Draw each of
the circuits below, label the voltage at each node, and show how you calculated the node
voltages.
Figure 1: Simple Transistor Circuits
Problem 2:
Now, lets use a more realistic model of the transistor by using Beta=100.
You should continue to
model V
be
=0.7V for all transistors.
As above, draw each of the circuits below, label the voltage
at each node, and show how you calculated the node voltages.
Figure 2: More Simple Transistor Circuits
Problem 3:
In the first problem of problem set 1, you analyzed a circuit for converting AC to DC.
In
practice, that circuit is generally followed with a voltage regulator that insures that the
powered by the DC supply have a precise power supply.
The heart of any voltage regulator
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 Fall '07
 OLIAI
 Transistor, voltage regulator

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