Digital clock recovery circuit with phase interpolation

Details Digital clock recovery circuit with phase interpolation Digital clock recovery circuit with phase interpolation

1997-09-11

2000-09-19

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375375, 327153, H04L 2540, H04L 700, H03D 324

Patent

active

061223360

ABSTRACT:
The present invention provides a digital clock recovery circuit, which includes a frequency synthesizer generating a number of clock phase signals. The digital clock recovery circuit also includes a phase interpolation unit, which interpolates the clock phase signals from the frequency synthesizer to increase the number of clock phase signals. Additionally, the digital clock recovery circuit also includes a phase detector, a digital filter, and a phase selection unit. The phase detector has an output connected to a digital filter, which is connected to the phase selection unit. The phase detector sends signals filtered through the digital filter to select clock phase signals input into the phase selection unit from the phase interpolation unit. The output of the phase selector provides the recovered clock signal and also connected to the input phase detector.

REFERENCES:
patent: 3911368 (1975-10-01), Tarczy-Hornoch
patent: 4216544 (1980-08-01), Boleda et al.
patent: 4633193 (1986-12-01), Scordo
patent: 4744096 (1988-05-01), Roux
patent: 5235622 (1993-08-01), Yoshida
patent: 5485490 (1996-01-01), Leung et al.
patent: 5502750 (1996-03-01), Co et al.
patent: 5568099 (1996-10-01), Du

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