Timing extraction circuit

Details Timing extraction circuit Timing extraction circuit

1983-04-20

1985-07-02

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375120, 307516, 328133, H04L 702

Patent

active

045272778

ABSTRACT:
A timing extraction circuit includes a phase comparator, a charge pump circuit, a filter circuit and a voltage controlled oscillator, these components constituting a phase-locked loop. The phase comparator compares the phases of a digital data signal and a timing signal and supplies first and second difference signals to the charge pump circuit. The charge pump circuit detects a phase error corresponding to the difference between the integrals of the first and second difference signals. The filter circuit supplies a control signal corresponding to the phase error to the voltage controlled oscillator. The voltage controlled oscillator generates the timing signal having a period corresponding to the control signal.

REFERENCES:
patent: 3670249 (1972-06-01), Meslener
patent: 4166979 (1979-09-01), Waggener
patent: 4191976 (1980-03-01), Braun
patent: 4218771 (1980-08-01), Hogge, Jr.
patent: 4305151 (1981-12-01), Johnson et al.
patent: 4371974 (1983-02-01), Dugan
patent: 4371975 (1983-02-01), Dugan
patent: 4380815 (1983-04-01), Clendening
patent: 4400667 (1983-08-01), Belkin

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