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Example 1<br />
Problem: Find diode voltage for diode with given specifications<br />
Given data: I S =0.1 fA, I D = 300 µA / 1mA<br />
Assumptions: Room-temperature dc operation with V T =25mV<br />
Analysis:<br />
With I S =0.1 fA, I D = 300 µA<br />
V<br />
D<br />
= V<br />
T<br />
⎛ ⎞<br />
⎜ I ⎟<br />
ln 1+<br />
= (0.025V)ln(1+<br />
3×<br />
10 -4 ) 0.718V<br />
10 -16 A<br />
⎜ ⎟<br />
=<br />
⎜ ⎟<br />
I D<br />
A<br />
⎝ S ⎠<br />
With I D = 1 mA, I S =0.1 fA<br />
V<br />
D<br />
=0.748V<br />
ELE2110A © 2008<br />
Lecture 02 - 17
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