Electronic Devices and Circuit Theory

Robert Boylestad, Louis Nashelsky

Chapter 2

Diode Applications - all with Video Answers

Educators

Chapter Questions

Problem 1

a. Using the characteristics of Fig. $152 \mathrm{~b}$, determine $I_{D}, V_{D}$, and $V_{R}$ for the circuit of Fig. $152 \mathrm{a}$.
b. Repeat part (a) using the approximate model for the diode, and compare results.
c. Repeat part (a) using the ideal model for the diode, and compare results.

Pawan Yadav

Pawan Yadav

Numerade Educator

Problem 2

a. Using the characteristics of Fig. $152 \mathrm{~b}$, determine $I_{D}$ and $V_{D}$ for the circuit of Fig. $153 .$
b. Repeat part (a) with $R=0.47 \mathrm{k} \Omega$.
c. Repeat part (a) with $R=0.68 \mathrm{k} \Omega$.
d. Is the level of $V_{D}$ relatively close to $0.7 \mathrm{~V}$ in each case?
How do the resulting levels of $I_{D}$ compare? Comment accordingly.

Prem Bijarniya

Numerade Educator

Problem 3

Determine the value of $R$ for the circuit of Fig. 153 that will result in a diode current of $10 \mathrm{~mA}$ if $E=7 \mathrm{~V}$. Use the characteristics of Fig. $152 \mathrm{~b}$ for the diode.

Pawan Yadav

Numerade Educator

Problem 4

a. Using the approximate characteristics for the Si diode, determine $V_{D}, I_{D}$, and $V_{R}$ for the circuit of Fig. 154 .
b. Perform the same analysis as part (a) using the ideal model for the diode.
c. Do the results obtained in parts (a) and (b) suggest that the ideal model can provide a good approximation for the actual response under some conditions?

Pawan Yadav

Numerade Educator

Problem 5

Determine the current $I$ for each of the configurations of Fig. 155 using the approximate equivalent model for the diode.

Narayan Hari

Numerade Educator

Problem 6

Determine $V_{o}$ and $I_{D}$ for the networks of Fig. 156 .

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 7

Determine the level of $V_{o}$ for each network of Fig. $157 .$

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 8

Determine $V_{o}$ and $I_{D}$ for the networks of Fig. 158 .

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 9

Determine $V_{o_{1}}$ and $V_{o_{2}}$ for the networks of Fig. 159 .

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 10

Determine $V_{o}$ and $I_{D}$ for the networks of Fig. $160 .$

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 11

Determine $V_{o}$ and $I$ for the networks of Fig. 161 .

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 12

Determine $V_{o_{1}}, V_{o 2}$, and $I$ for the network of Fig. $162 .$

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 13

Determine $V_{o}$ and $I_{D}$ for the network of Fig. $163 .$

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 14

Determine $V_{o}$ for the network of Fig. 39 with $0 \mathrm{~V}$ on both inputs.

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 15

Determine $V_{o}$ for the network of Fig. 39 with $10 \mathrm{~V}$ on both inputs.

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 16

Determine $V_{o}$ for the network of Fig. 42 with $0 \mathrm{~V}$ on both inputs.

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 17

Determine $V_{o}$ for the network of Fig. 42 with $10 \mathrm{~V}$ on both inputs.

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 18

Determine $V_{o}$ for the negative logic OR gate of Fig. 164 .

Varsha Aggarwal

Varsha Aggarwal

Numerade Educator

Problem 19

Determine $V_{o}$ for the negative logic AND gate of Fig. 165 .

Amit Srivastava

Amit Srivastava

Numerade Educator

Problem 20

Determine the level of $V_{o}$ for the gate of Fig. 166 .

Kajal Gautam

Numerade Educator

Problem 21

Determine $V_{o}$ for the configuration of Fig. $167 .$

Varsha Aggarwal

Varsha Aggarwal

Numerade Educator

Problem 22

Assuming an ideal diode, sketch $v_{i}, v_{d}$, and $i_{d}$ for the half-wave rectifier of Fig. 168 . The input is a sinusoidal waveform with a frequency of $60 \mathrm{~Hz}$. Determine the profit value of $v_{i}$ from the given dc level.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 23

Repeat Problem 22 with a silicon diode $\left(V_{K}=0.7 \mathrm{~V}\right)$.

Narayan Hari

Numerade Educator

Problem 24

Repeat Problem 22 with a $10 \mathrm{k} \Omega$ load applied as shown in Fig. $169 .$ Sketch $v_{L}$ and $i_{L}$.

Stanley Enemuo

Numerade Educator

Problem 25

For the network of Fig. 170 , sketch $v_{o}$ and determine $V_{\mathrm{d}}$.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 26

For the network of Fig. 171, sketch $v_{o}$ and $i_{R}$.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 27

a. Given $P_{\max }=14 \mathrm{~mW}$ for each diode at Fig. 172, determine the maximum current rating of each diode (using the approximate equivalent model).
b. Determine $I_{\max }$ for the parallel diodes.
c. Determine the current through each diode at $V_{i_{\max }}$ using the results of part (b).
d. If only one diode were present, which would be the expected result?

Narayan Hari

Numerade Educator

Problem 28

A full-wave bridge rectifier with a $120-\mathrm{V} \mathrm{rms}$ sinusoidal input has a load resistor of $1 \mathrm{k} \Omega$.
a. If silicon diodes are employed, what is the dc voltage available at the load?
b. Determine the required PIV rating of each diode.
c. Find the maximum current through each diode during conduction.
d. What is the required power rating of each diode?

Narayan Hari

Numerade Educator

Problem 29

Determine $v_{o}$ and the required PIV rating of each diode for the configuration of Fig. $173 .$ In addition, determine the maximum current through each diode.

Narayan Hari

Numerade Educator

Problem 30

Sketch $v_{o}$ for the network of Fig. 174 and determine the de voltage available.

Narayan Hari

Numerade Educator

Problem 31

Sketch $v_{o}$ for the network of Fig. 175 and determine the dc voltage available.

Dominador Tan

Numerade Educator

Problem 32

Determine $v_{o}$ for each network of Fig. 176 for the input shown.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 33

Determine $v_{o}$ for each network of Fig. 177 for the input shown.

Thomas Thompson

Thomas Thompson

Numerade Educator

Problem 34

Determine $v_{o}$ for each network of Fig. 178 for the input shown.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 35

Determine $v_{o}$ for each network of Fig. 179 for the input shown.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 36

Sketch $i_{R}$ and $v_{o}$ for the network of Fig. 180 for the input shown.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 37

Sketch $v_{o}$ for each network of Fig. 181 for the input shown.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 38

Sketch $v_{o}$ for each network of Fig. 182 for the input shown.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 39

For the network of Fig. $183:$
a. Calculate $5 \tau$.
b. Compare $5 \tau$ to half the period of the applied signal.
c. Sketch $v_{o}$.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 40

Design a clamper to perform the function indicated in Fig. $184 .$

Khoobchandra Agrawal

Khoobchandra Agrawal

Numerade Educator

Problem 41

Design a clamper to perform the function indicated in Fig. $185 .$

Khoobchandra Agrawal

Khoobchandra Agrawal

Numerade Educator

Problem 42

a. Determine $V_{L}, I_{L}, I_{Z}$, and $I_{R}$ for the network of Fig. 186 if $R_{L}=180 \Omega$.
b. Repeat part (a) if $R_{L}=470 \Omega$.
c. Determine the value of $R_{L}$ that will establish maximum power conditions for the Zener diode.
d. Determine the minimum value of $R_{L}$ to ensure that the Zener diode is in the "on" state.

AK

Ankur Khosla

Numerade Educator

Problem 43

a. Design the network of Fig. 187 to maintain $V_{L}$ at $12 \mathrm{~V}$ for a load variation $\left(I_{L}\right)$ from $0 \mathrm{~mA}$ to $200 \mathrm{~mA}$. That is, determine $R_{S}$ and $V_{Z}$.
b. Determine $P_{Z \max }$ for the Zener diode of part (a).

Chai Santi

Numerade Educator

Problem 44

For the network of Fig. 188 , determine the range of $V_{i}$ that will maintain $V_{L}$ at $8 \mathrm{~V}$ and not exceed the maximum power rating of the Zener diode.

Narayan Hari

Numerade Educator

Problem 45

Design a voltage regulator that will maintain an output voltage of $20 \mathrm{~V}$ across a $1-\mathrm{k} \Omega$ load with an input that will vary between $30 \mathrm{~V}$ and $50 \mathrm{~V}$. That is, determine the proper value of $R_{s}$ and the maximum current $I_{Z M}$.

Mederic Rodriguez

Mederic Rodriguez

Numerade Educator

Problem 46

Sketch the output of the network of Fig. 145 if the input is a $50-V$ square wave. Repeat for a 5- $\mathrm{V}$ square wave.

M Hassan Anwar

Numerade Educator

Problem 47

Determine the voltage available from the voltage doubler of Fig. 123 if the secondary voltage of the transformer is $120 \mathrm{~V}(\mathrm{rms})$.

Vishal Gupta

Numerade Educator

Problem 48

Determine the required PIV ratings of the diodes of Fig. 123 in terms of the peak secondary voltage $V_{m}$

Narayan Hari

Numerade Educator

Problem 49

Perform an analysis of the network of Fig. $156 b$ using PSpice Windows.

Khoobchandra Agrawal

Khoobchandra Agrawal

Numerade Educator

Problem 50

Perform an analysis of the network of Fig. 161 b using PSpice Windows.

Khoobchandra Agrawal

Khoobchandra Agrawal

Numerade Educator

Problem 51

Perform an analysis of the network of Fig. 162 using PSpice Windows.

Khoobchandra Agrawal

Khoobchandra Agrawal

Numerade Educator

Problem 52

Perform a general analysis of the Zener network of Fig. 188 using PSpice Windows.

Khoobchandra Agrawal

Khoobchandra Agrawal

Numerade Educator

Problem 53

Repeat Problem 49 using Multisim.

Melissa Barry

Numerade Educator

Problem 54

Repeat Problem 50 using Multisim.

Kajal Gautam

Numerade Educator

Problem 55

Repeat Problem 51 using Multisim.

Kajal Gautam

Numerade Educator

Problem 56

Repeat Problem 52 using Multisim.

Kajal Gautam

Numerade Educator