Phase synchronizer and data reproducing apparatus

Details Phase synchronizer and data reproducing apparatus Phase synchronizer and data reproducing apparatus

1997-04-02

1999-11-09

Vo, Don N.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

331 17, 331 34, 327157, 327159, H03D 324

Patent

active

059828366

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.

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patent: 5614870 (1997-03-01), Sauer et al.

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