Solutions Manual for
Digital Fundamentals,
11e Thomas Floyd (All
Chapters)
PR
O
FD
O
C
, PART 1
Problem Solutions
PR
O
FD
O
C
,Chapter 1
CHAPTER 1
INTRODUCTORY CONCEPTS
Section 1-1 Digital and Analog Quantities
1. Digital data can be transmitted and stored more efficiently and reliably than analog data. Also,
digital circuits are simpler to implement and there is a greater immunity to noisy environments.
2. Pressure is an analog quantity.
3. A clock, a thermometer, and a speedometer can have either an analog or a digital output.
Section 1-2 Binary Digits, Logic Levels, and Digital Waveforms
PR
4. In positive logic, a1 is represented by a HIGH level and a 0 by a LOW level. In negative logic,
a 1 is represented by a LOW level, and a 0 by a HIGH level.
5. HIGH = 1; LOW = 0. See Figure 1-1.
O
FD
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6. A 1 is a HIGH and a 0 is a LOW:
(a) HIGH, LOW, HIGH, HIGH, HIGH, LOW, HIGH
(b) HIGH, HIGH, HIGH, LOW, HIGH, LOW, LOW, HIGH
2
, Chapter 1
7. See Figure 1-2.
Ampl
= 10 V
tPW = 2.7 s
PR
8. T = 4 ms. See Figure 1-3.
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FD
O
1 1
9. f= = = 0.25 kHz = 250 Hz
C
T 4 ms
10. The waveform in Figure 1-61 is periodic because it repeats at a fixed interval.
11. tW = 2 ms; T = 4 ms
t 2 ms
% duty cycle = W 100 = 100 = 50%
T 4 ms
12. See Figure 1-4.
3
Digital Fundamentals,
11e Thomas Floyd (All
Chapters)
PR
O
FD
O
C
, PART 1
Problem Solutions
PR
O
FD
O
C
,Chapter 1
CHAPTER 1
INTRODUCTORY CONCEPTS
Section 1-1 Digital and Analog Quantities
1. Digital data can be transmitted and stored more efficiently and reliably than analog data. Also,
digital circuits are simpler to implement and there is a greater immunity to noisy environments.
2. Pressure is an analog quantity.
3. A clock, a thermometer, and a speedometer can have either an analog or a digital output.
Section 1-2 Binary Digits, Logic Levels, and Digital Waveforms
PR
4. In positive logic, a1 is represented by a HIGH level and a 0 by a LOW level. In negative logic,
a 1 is represented by a LOW level, and a 0 by a HIGH level.
5. HIGH = 1; LOW = 0. See Figure 1-1.
O
FD
O
C
6. A 1 is a HIGH and a 0 is a LOW:
(a) HIGH, LOW, HIGH, HIGH, HIGH, LOW, HIGH
(b) HIGH, HIGH, HIGH, LOW, HIGH, LOW, LOW, HIGH
2
, Chapter 1
7. See Figure 1-2.
Ampl
= 10 V
tPW = 2.7 s
PR
8. T = 4 ms. See Figure 1-3.
O
FD
O
1 1
9. f= = = 0.25 kHz = 250 Hz
C
T 4 ms
10. The waveform in Figure 1-61 is periodic because it repeats at a fixed interval.
11. tW = 2 ms; T = 4 ms
t 2 ms
% duty cycle = W 100 = 100 = 50%
T 4 ms
12. See Figure 1-4.
3
