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Chapter 4: Amplitude Modulation Transmission – Tomasi Review

Chapter 4: Amplitude Modulation Transmission

This is the summary notes of the important terms and concepts in Chapter 4 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 4

AMPLITUDE MODULATION
TRANSMISSION


Items

Definitions

Terms

1

The process of impressing low-frequency information signals
onto a high-frequency carrier signal.

Modulation

2

The reverse process of modulation where the received signals
are transformed back to their original form.

Demodulation

3

The process of changing the amplitude of a relatively high
frequency carrier signal in proportion with the instantaneous value of the modulating
signal.

Amplitude Modulation

4

Frequencies that are high enough to be efficiently radiated by
the antenna and propagated through free space.

Radio Frequencies

5

The modulated output waveform from an AM modulator is?

AM Envelope

6

Sometimes called conventional AM or simply AM.

AM DSBFC

7

The band of frequencies between fc – fm (max) and fc.

Lower Sideband

8

Any frequency within the lower sideband is called.

Lower Side Frequency

9

The band of frequencies between fc and fc + fm(max)

Upper Sideband

10

Any frequency within the upper sideband is called?

Upper Side Frequency

11

The term used to describe the amount of amplitude change
(modulation) present in an AM waveform signal.

Coefficient of Modulation

12

The coefficient of modulation stated as a percentage.

Percent Modulation

13

The maximum percent modulation that can be imposed without
causing excessive distortion.

100%

14

The _______ in a transmitter where modulation occurs
determines whether the circuit is a low or a high-level transmitter.

Location

15

The modulation takes place prior to the output element of the
final stage of the transmitter.

Low-Level Modulation

16

The modulation takes place in the final element of the final
stage where the carrier signal is at its maximum amplitude.

High-Level Modulation

17

The amplitude of the output signal depends on the amplitude of
the input carrier and the voltage gain of the amplifier.

Emitter Modulation

18

A class C modulator capable of nonlinear mixing and the
modulating signal is applied directly to the collector.

Collector Modulator

19

Used to translate the low-frequency intelligence signals to
radio-frequency signals that can be efficiently radiated from an antenna and
propagated through free space.

Up-converter

20

Are used for observing the modulation characteristics of AM
transmitters.

Trapezoidal Pattern

21

A form of amplitude distortion introduced when the positive
and negative alternations in the AM modulated signal are not equal
(nonsymmetrical modulation).

Carrier Shift

22

Complex waveforms comprised of two or more frequencies.

Nonsinusoidal Signals

23

Are complex waves made up of two or more harmonically related
sine waves and include square, rectangular, and triangular waves.

Complex Repetitive
Waveforms

24

A form of AM where signals from two separate information
sources modulate the same carrier frequency at the same time without
interfering with each other. The information sources modulate the same
carrier after it has been separated into two carrier signals that are 90º out
of phase with each other.

Quadrature Amplitude
Modulation
( QAM )

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