What is frequency synthesizer?

Frequency Synthesizer

A frequency synthesizer is an electronic system for generating any of a range of frequencies from a single fixed timebase or oscillator. They are found in many modern devices, including radio receivers, mobile telephones, radiotelephones, walkie-talkies, CB radios, satellite receivers, GPS systems, etc. A frequency synthesizer can combine frequency multiplication, frequency division, and frequency mixing (the frequency mixing process generates sum and difference frequencies) operations to produce the desired output signal.

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Some articles on frequency synthesizer:

Frequency Synthesizer - Use As A Frequency Modulator
... Many PLL frequency synthesizers can also generate frequency modulation (FM) ... output of the loop filter, directly varying the frequency of the VCO and the synthesizer output ... will also appear at the phase comparator output, reduced in amplitude by any frequency division ...

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