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Solutions Manual for
Digital Fundamentals,
11e Thomas Floyd (All
Chapters)

, PART 1

Problem Solutions

,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
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.




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




8. T = 4 ms. See Figure 1-3.




1 1
9. f= = = 0.25 kHz = 250 Hz
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.




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