7 10 points the purpose of this problem is to practice creating a smal
7. (10 points) The purpose of this problem is to practice creating a small-signal model
for a diode. Consider an exponential diode model with no internal series resistance,
Is = X3ID PA and biased at VD=+0.5 V. [DO NOT POST OR SHARE ANY PART OF
THIS COPYRIGHTED ASSIGNMENT. ALL RIGHTS RESERVED.]
(a) What is the diode's quiescent point current? (b) Draw a small-signal Norton
equivalent circuit model for the diode and label the elements with their values including
the differential conductance. (c) Draw a small-signal Thevenin equivalent circuit model
for the diode and label the elements with their values including the differential resistance.
8. (4 points) Repeat part (a) of the last problem but with the diode biased at VD=0 V.
(b) What is the differential resistance of this diode?
9. (7 points) The purpose of this problem is to reinforce concepts of differential resistance.
Consider an imaginary device with a current voltage characteristic given by
I= Isat V/(V sat+V) with Isat = X3ID mA and Vsat = X3ID mV. The device is biased at V = V sat.
(a) What is the DC current flowing through the device? (b) What is the differential
resistance of the device? As always, be sure to show your work.
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