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1
EECS 215 W08 Problem Set #5
Assigned:
Monday, 11Feb2008
Due:
Friday, 22Feb2008
Homework is due at the
beginning
of lecture.
Reading Assignment:
Class notes
1.
Determine the diode current (
I
D
) and voltage (
V
D
) for the
circuit to the right for
V
DD
=5V,
R
=8k
Ω
,
I
0
=10
14
A, and
kT/q=0.026V. Use the diode model where
( )
1
/
0
−
=
kT
qV
D
D
e
I
I
. This requires the solution of a
transcendental equation
, where you will need to use a
special “solver” (calculator, Matlab, etc), iterative method, numerical technique, etc. You
may choose any of these methods to solve, but you MUST indicate how you have solved
(and include a copy of source code, etc, where applicable).
2.
In your first lab this semester (DC Lab), you took CurrentVoltage data for a light
emitting diode (LED). For this LED, determine the current and voltage for the LED in the
case where the diode is connected in the circuit of problem 1, where
R
=400
Ω
and
V
DD
=3V. Use the graphical circuit analysis method defined below.
a.
Obtain the data file for the diode on the CTools website, called “diode_IV.m”.
The file is a text file that can be used directly in Matlab to input the diode current
and voltage. Plot current versus voltage for the diode using Matlab or other
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 Winter '08
 Phillips
 Volt

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