Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

1993-04-20

1995-08-29

Coles, Sr., Edward L.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

4551651, 4551831, 455260, 331 17, 331 18, 331 23, 331 25, H03D 324, H03K 513, H03L 700

Patent

active

054467675

ABSTRACT:
A frequency synthesizer which comprises a voltage controlled oscillator; a unit for outputting a value corresponding to a differential phase of a reference signal at a predetermined frequency as a first differential phase; a unit for sampling an oscillating signal corresponding to an output of the voltage controlled oscillator K times per period of a repeating frequency f.sub.r (f.sub.r is an arbitrary frequency) and for repetitively generating phase information of the oscillating signal in the form of saw-tooth-like wave; a unit for calculating the difference between adjacent phase information in phase information of the oscillating signal outputted as a saw-tooth-like wave, and for outputting this difference as a second differential phase; a comparator for calculating the difference between the first and second differential phases; a signal processing unit for integrating an output of the comparator; and a unit for converting an output of the signal processing unit to a voltage to control the voltage controlled oscillator.

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"Enhanced Digital Frequency Synthesizer and Its Analysis", H. Kikawa, et al, Dept. of Electrical Engineering, University of South Florida, pp. 628-631.

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