Soft reference switch for phase locked loop

Details Soft reference switch for phase locked loop Soft reference switch for phase locked loop

2011-06-21

2011-06-21

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S150000, C327S156000, C327S159000, C331S011000, C331S017000, C331S025000

Reexamination Certificate

active

07965115

ABSTRACT:
A phase locked loop includes a digital controlled oscillator and a number of phase detectors, each having a first input connected to a reference source and a second input coupled to the output of the digital controlled oscillator, and an output for producing a phase error signal. A loop filter coupled to the output of each phase detector has an output and a feedback input. An adjustment unit for derives an adjustment signal for the digital controlled oscillator from one or more of the loop filters by selecting or combining output signals from the loop filters taking into account the stability of said reference sources. The adjustment signal for the digital controlled oscillator produced by the adjustment unit is coupled to each of the feedback inputs of the loop filters. This arrangement results in hitless reference switching.

REFERENCES:
patent: 4511859 (1985-04-01), Dombrowski
patent: 4538120 (1985-08-01), Hawkes
patent: 4835481 (1989-05-01), Geissler et al.
patent: 5666084 (1997-09-01), Schulz et al.
patent: 6114920 (2000-09-01), Moon et al.
patent: 6147562 (2000-11-01), Quirmbach
patent: 2002/0061088 (2002-05-01), Kon
patent: 2008/0079510 (2008-04-01), Seethamraju et al.

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