1
EECS 215 Winter 2007 Problem Set #5
Assigned:
Wednesday, 10/10/07
Due:
Wednesday, 10/24/07 (But do not wait until after Exam 1 to start!)
Homework is due at the
beginning
of lecture.
Reading Assignment:
Review A&S through Chapter 4, class notes
1.
A&S 5.92, determine the voltage gain v
o
/v
i
for the amplifier below.
2.
Determine the diode current and voltage for the circuit to the right for V
DD
=4V, R=2k
Ω
,
I
0
=10
15
A, and kT/q=0.026V. Use the diode model where
(
)
1
/
0
−
=
kT
qV
D
D
e
I
I
. To solve
this problem, let’s use multiple techniques.
a.
Graphical technique: For this technique, you can find the solution by plotting the IV
relations of the resistor and the diode on the same axes. First, plot I
D
vs. V
D
for the
diode. On the same axes, plot (not draw) the “load line” for the resistor, given by
(
)
R
V
V
I
D
DD
D
/
−
=
. The intersection point of the
two curves provides the solution for I
D
and V
D
.
b.
Numerical technique: The IV relations for the diode
and resistor provide a system of 2 equations with
two unknowns (I
D
and V
D
). Note that this is a
“transcendental equation”. You can solve these
numerically using a variety of techniques, including
builtin Matlab solvers, advanced solvers on calculators, or an iterative method. You
must indicate equations and methods used to solve the equation.
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 Fall '08
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