Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1995-11-02
1997-08-12
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
327157, 331 2, 331 25, 331 34, 331 57, H03D 324
Patent
active
056573596
ABSTRACT:
A phase synchronizer is disclosed that provides a stable output signal while improving synchronization speed. The phase synchronizer includes one or two feedback circuits. The feedback circuit(s) includes a phase comparator for generating a pulse signal in accordance with a difference between the phases of an input signal and a feedback signal, a charge pump for converting the pulse signal supplied from the phase comparator to an analog voltage signal, a loop filter for removing high-frequency signal components from the analog voltage signal output from the charge pump and supplying as a filtered analog voltage signal (LF1 or LF2), and a voltage-controlled oscillator coupled to the loop filter for generating an oscillation output signal having a frequency which varies in accordance with the filtered analog signal (LF1 or LF2). The oscillation output signal is also supplied as the feedback signal to the phase comparator.
REFERENCES:
patent: 4464771 (1984-08-01), Sorensen
patent: 4656369 (1987-04-01), Lou
patent: 5075639 (1991-12-01), Taya
patent: 5136260 (1992-08-01), Yousefi-Elezei
patent: 5359298 (1994-10-01), Abe
patent: 5422604 (1995-06-01), Jokura
Sakae Keisuke
Yoshikawa Kimio
Chin Stephen
Fujitsu Limited
Vo Don
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