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Tutorial Seven (Diodes)

The document provides a tutorial on diodes, including tasks such as plotting input/output characteristics, calculating currents in various circuits, and analyzing the effects of input changes on output voltage. It involves using ideal and constant-voltage diode models for calculations and includes specific figures for reference. Additionally, it explores the small-signal model of diodes in the context of coupling signals while blocking DC currents.

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27 views2 pages

Tutorial Seven (Diodes)

The document provides a tutorial on diodes, including tasks such as plotting input/output characteristics, calculating currents in various circuits, and analyzing the effects of input changes on output voltage. It involves using ideal and constant-voltage diode models for calculations and includes specific figures for reference. Additionally, it explores the small-signal model of diodes in the context of coupling signals while blocking DC currents.

Uploaded by

sum
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Tutorial Seven (Diodes)

1. Plot the input/output characteristics of the circuits depicted in


Fig. 1 using an ideal model for the diodes. Assume VB = 2 V.

Fig. 1

2. For the circuit depicted in Fig. 2, calculate IX as a function of


VX .

Fig. 2

3. Calculate the current flowing through R1 as a function of Iin


Assume a constant-voltage diode model.

Fig. 3

Fig. 3
4. Beginning with VD ,on ≈ 800mV , for each diode, calculate the
change in Vout if I in change from 3 mA to 3.1 mA.

Fig. 4

5. In the circuit shown in Fig. 5, I is a dc current and vs is a


sinusoidal signal. Capacitors C1 and C2 are very large; their
function is to couple the signal to and from the diode but block
the dc current from flowing into the signal source or the load
(not shown). Use the diode small-signal model to show that the
signal component of the output voltage is

VT
vo = vs
VT + IRs

If vs = 10 mV, find vo for I = 1 mA, 0.1 mA and 1µA.


At what value of I does vo become half of vs?

Fig. 5

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