Newnes Guide to Radio and Communications Technology by Ian Poole

Author:Ian Poole [Ian Poole]
Language: eng
Format: epub
Published: 2008-04-12T20:23:00+00:00

Figure 5.33 A half lattice crystal filter circuit

Demodulation

The signals that appear at the output of the intermediate frequency amplifier and filter section of a receiver consist of a radio frequency type of signal. In other words they consist of a carrier with the required modulation superimposed. To remove the modulation, a circuit called a demodulator is required. While these circuits are often termed demodulators, the name detector is also used almost interchangeably to describe them as well.

The type of demodulator and hence the circuitry of the demodulator will depend upon the type of modulation which is being used. Often different demodulators are required for different modes of transmission. When a receiver needs to be able to demodulate a variety of types of signal, different detectors are switched in.

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