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Chapter 2: Signal Analysis and Mixing by Wayne Tomasi – Review Notes

Chapter 2: Signal Analysis and Mixing

This is the summary notes of the important terms and concepts in Chapter 2 of the book "Electronic Communications System" by Wayne Tomasi. The notes are properly synchronized and concise for much better understanding of the book. Make sure to familiarize this review notes to increase the chance of passing the ECE Board Exam.


CHAPTER 2

SIGNAL ANALYSIS AND
MIXING


Items

Definitions

Terms

1

Electrical signals of which amplitude changes continuously
with respect to time with no breaks or discontinuities.

Analog Signals

2

Electrical signals that are described as discrete; their
amplitude maintains constant level for a prescribed period of time and then
it changes to another level with respect to time with no breaks or
discontinuities.

Digital Signals

3

Digital signal with only two levels possible.

Binary Signal

4

Digital signal with four levels possible.

Quaternary Signal

5

Is the mathematical analysis of the frequency, bandwidth, and
voltage level of a signal?

Signal Analysis

6

A signal that repeats at a uniform rate.

Periodic Wave

7

A description of signal with respect to time.

Time-domain
Representation

8

A time-domain instrument that shows signal waveforms.

Oscilloscope

9

The display on the cathode ray tube (CRT) that shows the shape
and instantaneous magnitude of the signal with respect to time.

Signal Waveform

10

A description of signal with respect to its frequency.

Frequency Domain
Representation

11

A frequency-domain instrument that shows
amplitude-versus-frequency plot.

Spectrum Analyzer

12

Any repetitive wave that is comprised of more than one
harmonically related sine or cosine wave.

Nonsinusoidal /
Complex Wave

13

A mathematical series developed in 1826 by French physicist
and mathematician Baron Jean Fourier used to analyze complex periodic wave.

Fourier Series

14

A mathematical tool that allows us to move back and forth
between the time and frequency domains. It is used in signal analysis to
represent the sinusoidal components of nonsinusoidal periodic waveforms.

Fourier Series

15

Waveform comprised of an average dc component and a series of
harmonically related sine or cosine wave.

Periodic Waveform

16

Is the integral multiple of the fundamental frequency?

Harmonic

17

Is the first harmonic and is equal to the frequency
(repetition rate) of the waveform.

Fundamental Frequency

18

If a periodic voltage waveform is symmetric about the vertical
axis, it is said to have axes, or mirror, symmetry and is called an ________.

even function

19

If a periodic voltage waveform is symmetric about a line
midway between the vertical axis and the negative horizontal axis and passing
through the coordinate origin, it is said to have point, or skew, symmetry is
called an ______.

odd function

20

If a periodic voltage waveform is such that the waveform for
the first half cycle repeats itself except with the opposite sign for the
second half cycle, it is said to have ________.

half-wave symmetry

21

The ________ of a waveform consists of all the frequencies
contained in the waveform and their respective amplitudes plotted in the
frequency domain.

frequency spectrum

22

The difference between the highest and lowest frequencies
contained in the information. It is also the difference between the highest
and lowest frequencies that the channel will allow to pass through it.

Bandwidth of an
information signal

23

The ratio of the active time of the pulse to the period of the
waveform.

Duty Cycle

24

The rate at which energy is dissipated, delivered, or used,
and is a function of the square of the voltage or current

Electrical Power

25

A fourier transform where a time-domain signal is sampled at
discrete times.

Discrete Fourier Transform

26

A new algorithm of fourier transform developed by Cooley and
Tukey in 1965 where the computing time is proportional to n log 2n rather
than n2.

Fast Fourier Transform

27

The process of combining two or more signals

Mixing

28

Occurs when two or more signals combine in a linear device,
such as a passive network or a small-signal amplifier. Also called linear
mixing.

Linear Summing

29

An amplifier where the output is simply the original input
signal amplified by its gain.

Linear Amplifier

30

Occurs when two or more signals are combined in a nonlinear
device such as a diode or large-signal amplifier.

Nonlinear Mixing

31

Undesired generation of multiples or harmonics of that
frequency.

Harmonic Distortion

32

Desired generation of multiples or harmonics of that
frequency.

Frequency Multiplication

33

The sum and difference of the two original frequencies.

Cross Products

34

The generation of any unwanted cross-product frequency when
two or more frequencies are mixed in a nonlinear device.

Intermodulation Distortion

35

Desired cross products produced by mixing in a nonlinear
device.

Modulation

Complete List of Reviewers in Electronic Communications System per Chapter

Important List of Communications Engineering Materials

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