Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

1992-02-25

1993-02-02

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

307271, 328 14, H03L 700

Patent

active

051840936

ABSTRACT:
A frequency synthesizer, including a direct digital synthesizer (DDS) for providing wave amplitude data as a standard signal source, and a phase lock loop for comparing a branched synthesizer frequency with the standard signal source at a phase comparator. A frequency converter converts the output frequency of the DDS to a higher frequency and provides the resultant higher frequency to the phase comparator in the phase loop. A small loop dividing ratio is obtained by converting the low frequency of the DDS to a higher frequency. A spurious of the synthesizer output signal is reduced and provides a low power consumption apparatus.

REFERENCES:
patent: 4659999 (1987-04-01), Motoyama et al.
patent: 4951004 (1990-08-01), Sheffer et al.
patent: 4965533 (1990-10-01), Gilmore
patent: 5036295 (1991-07-01), Kamitani
Bramble, "Direct Digital Frequency Synthesis", Proc. 35th Ann. Freq. Control Symposium, May 1981, pp. 406-414.

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