Phase locked loop circuit providing increase locking operation s

Details Phase locked loop circuit providing increase locking operation s Phase locked loop circuit providing increase locking operation s

1994-10-06

1996-04-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

331 1A, 331 25, 331 57, 331DIG2, 375376, H03L 706

Patent

active

055065317

ABSTRACT:
A phase locked loop circuit comprising a first counter for dividing a reference frequency at a division ratio predetermined or determined by an input unit, a second counter for dividing a frequency of an output signal from the phase locked loop circuit at a division ratio predetermined or determined by a different input unit, a phase detector for inputting output signals from the first and second counters and generating a voltage based on a phase difference between the inputted signals, a low pass filter for low pass filtering an output signal from the phase detector, and a voltage controlled oscillator for generating a frequency signal proportioned to an output voltage from the low pass filter. The phase locked loop circuit further comprises an unlock detector for generating a control signal for synchronization of one of the first and second counters with an earlier phase in response to an unlocked signal from the phase detector.

REFERENCES:
patent: 4975651 (1990-12-01), Hagiwara
patent: 5111151 (1992-05-01), Ii
patent: 5144254 (1992-09-01), Wilke
patent: 5162910 (1992-11-01), Willis
patent: 5172357 (1992-12-01), Taguchi
patent: 5180933 (1993-01-01), Krzyzanowski
patent: 5180992 (1993-01-01), Akiyama et al.
patent: 5307382 (1994-04-01), Pang
patent: 5317283 (1994-05-01), Korhonen

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