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Study of Amplitude Modulation and Demodulation electrnics

Answer 1

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RF TECHNOLOGY & DESIGN

Amplitude modulation AM demodulation

- overview or tutorial of the basics of amplitude modulation, AM demodulation or detection methods used within radio receivers.

AM DEMODULATION TUTORIAL INCLUDES

AM demodulation overview

Diode detector

Synchronous demodulation

The process of separating or extracting the modulation from a signal is called demodulation or detection.

For amplitude modulation, the process of demodulation or detection can be accomplished very simply using a diode, or it may be achieved in other ways that provide more effective demodulation of the waveform.

As amplitude modulation is still widely used as a result of its simplicity, receivers incorporating AM demodulators are manufactured in quantities of many millions each year. Within these radios a simple AM detector consisting of a diode is used.

AM demodulation or detection process

In order to look at the amplitude demodulation process it is necessary to first look at the format of an AM signal.

An AM signal consists of a carrier which acts as the reference. Any modulation that is applied then appears as sidebands which stretch out either side of the signal - each sideband is a mirror image of the other.


Spectrum of an amplitude modulated, AM signal

Within the overall AM signal the carrier possess the majority of the power - a fully modulated, i.e. 100% modulation - AM signal has sidebands which have 25% that of the main carrier.


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