Phase-locked loop circuit with dynamic backup

Details Phase-locked loop circuit with dynamic backup Phase-locked loop circuit with dynamic backup

1998-03-09

2000-08-29

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327160, 327162, 331 25, 331DIG2, H03L 706

Patent

active

061114421

ABSTRACT:
A phase-locked loop circuit with dynamic backup is disclosed. The phase-locked loop circuit with dynamic backup includes a phase comparator, a lowpass filter, a voltage-controlled oscillator, and a detection circuit. The phase comparator compares an input reference signal and a feedback output signal from an output of the phase-locked loop circuit for generating a voltage signal representing the phase difference between the input reference signal and the feedback output signal. After the voltage signal is filtered by the lowpass filter, the filtered voltage signal is sent to the voltage-controlled oscillator for generating the feedback output signal. Coupled to the phase comparator, the detection circuit detects whether or not the phase-locked loop circuit is in lock with the input reference signal. In response to a determination that the phase-locked loop circuit is not in lock with the input reference signal, the detection circuit directs the input reference signal to bypass the phase comparator, the lowpass filter, and the voltage-controlled oscillator.

REFERENCES:
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patent: 5457428 (1995-10-01), Alder et al.
patent: 5552726 (1996-09-01), Wichman et al.
patent: 5561390 (1996-10-01), Hiiragizawa
patent: 5574757 (1996-11-01), Ogawa
patent: 5579353 (1996-11-01), Parmenter et al.
patent: 5864572 (1999-01-01), Bhagwan

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