Method and apparatus for achieving fast phase settling in a phas

Details Method and apparatus for achieving fast phase settling in a phas Method and apparatus for achieving fast phase settling in a phas

1995-05-10

1998-05-19

Vo, Don N.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375375, 375376, 327156, 331 17, 331 27, 331DIG2, H03D 324

Patent

active

057546070

ABSTRACT:
A method and an apparatus are provided to achieve fast phase settling when a reference signal for a phase locked loop changes from a first frequency to a second frequency, such as during holdover recovery in a synchronous optical network. The present method acquires the second frequency with a phase locked loop (24). After the frequency is acquired, the integral register (39) of the phase locked loop (24) is loaded with the contents of the output frequency register (34) of the phase locked loop (24). The phase detector (28) of the phase locked loop (24) is then realigned to the reference signal.

REFERENCES:
patent: 4792768 (1988-12-01), Fried et al.
patent: 4937536 (1990-06-01), Reinhardt et al.
patent: 5148123 (1992-09-01), Ries
patent: 5473285 (1995-12-01), Nuckolls et al.

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