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Semi-log Plot of <strong>Diode</strong> Current<br />
i<br />
D<br />
= I<br />
S<br />
⎛ v<br />
exp<br />
⎜<br />
⎝ V<br />
D<br />
T<br />
⎞<br />
⎟<br />
⎠<br />
i ⎛<br />
D<br />
vD1<br />
− vD<br />
2<br />
Let = exp<br />
⎜<br />
iD<br />
2 ⎝ VT<br />
⎞<br />
⎟<br />
⎠<br />
1<br />
=<br />
10<br />
v<br />
D1<br />
−<br />
v<br />
D2<br />
= V<br />
T<br />
= 2.3V<br />
ln10<br />
T<br />
≈ 60 mV<br />
ELE2110A © 2008<br />
Lecture 02 - 19
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