Spread spectrum phase-locked loop clock generator with VCO drive

Details Spread spectrum phase-locked loop clock generator with VCO drive Spread spectrum phase-locked loop clock generator with VCO drive

1994-11-23

1997-08-19

Chin, Wellington

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375200, 375204, 380 34, H03D 324, H04B 1500

Patent

active

056595875

ABSTRACT:
A phase-locked loop circuit comprises a VCO and a ramp generator. The ramp generator has an output connected to a control terminal of the VCO. A center frequency control loop is connected between a signal output terminal of the VCO and a first ramp control input of the ramp generator and a spread spectrum control loop is connected between the signal output terminal of the VCO and a second ramp control input of the ramp generator. The signals applied to the ramp control inputs of the ramp generator by the two control loops control respective characteristics of a periodic voltage ramp signal that is generated by the ramp generator at its signal output terminal.

REFERENCES:
patent: 4359779 (1982-11-01), Levine
patent: 4914674 (1990-04-01), Kimber et al.
patent: 4961203 (1990-10-01), Maufe et al.
patent: 5095288 (1992-03-01), Dent
patent: 5144260 (1992-09-01), Stribling et al.
patent: 5263055 (1993-11-01), Cahill
patent: 5488627 (1996-01-01), Hardin et al.
Gardner, Phaselock Techniques, 1970 p. 219.
Dixon, Spread Spectrum Systems, 1984, pp. 44-45.
IMISG501 System Clock Chip Data Sheet, May 2, 1994, pp. 1-7.
Interferrence Technology Engineers Master, R&B Enterprises, West Conshaochocken, Pennsylvania, 1994 (month unknown), pp. 88-89, 278, 280, (3 pgs of graphs).

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