Journal of Electronic Defense, November 1st, 1996
A frequency synthesizer translates the stable frequency of a precision frequency standard, such as a crystal-controlled oscillator, into one of thousands or millions of frequencies over a spectrum range. In its early embodiment, the frequency synthesizer consisted of a crystal-controlled oscillator (CCO) and a bank of quartz crystals. Frequencies were changed by plugging in different crystals. The accuracy and stability of such devices were primarily controlled by the quality of the crystals. These early oscillators were superseded by an approach known as "incoherent synthesis." A number of ...
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