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US 4,286,219 AGranted
High resolution frequency synthesizer
AssigneeCommunications Satellite Corporation
InventorShanti S. Gupta
Life of this patent
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Abstract
A programmable frequency source is used to synthesize a wide range of frequencies in small increments. A master oscillator and a single programmable divider are used. Each selected frequency possesses a phase jitter, predictable and a function of the master oscillator-to-output frequency relationship. The output of the frequency source is a square wave whose transitions are edge synchronous with the master oscillator.
Claims8
A high resolution frequency synthesizer for producing a pulse train of frequency f.sub.D comprising:
- an oscillator producing an output pulse train having a clock frequency of f.sub.ms, a programmable divider receiving an input signal that is a function of f.sub.ms and performing a division thereon in accordance with:
- [(N.sub.E +N.sub.R)f.sub.D ]/N.sub.R f.sub.D
- where,
- N.sub.E is an even number higher but not exceeding f.sub.ms /f.sub.D, and
- N.sub.R is the remainder of f.sub.ms /f.sub.D -N.sub.E, either a whole number or fraction but not a negative quantity
- to obtain an output f.sub.x, that is the frequency or number of bits per second which is an even multiple of f.sub.D and means for obtaining a symmetrical waveform from f.sub.x which is f.sub.D.
3 more elements
Dependencies are inferred from the claim text.