Broad band VCO control system for clock recovery

Details Broad band VCO control system for clock recovery Broad band VCO control system for clock recovery

1989-03-28

1990-07-24

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 25, 331DIG2, 375120, H03L 7087, H03L 7095

Patent

active

049437887

ABSTRACT:
A receiver circuit for data in NRZ1 coding transmitted at high data rates along optical fiber links, wherein in order to overcome problems of phase jitter in the incoming signal, a clock circuit is included comprising a phase locked loop with voltage controlled oscillator for generating a clock signal locked in phase to the incoming data signal, a phase detector for comparing the clock signal with the incoming data signal, a phase frequency detector for comparing the clock signal with a reference clock signal, a multiplexer for switching the phase locked loop to respond either to the output of the phase detector or the phase freqency detector, and a digital counting system for comparing the number of clock pulses generated in a reference period determined by the reference clock, the digital counting system controlling the multiplexer to switch to the output of the phase detector when it is determined that the clock signal is accurately following the reference clock signal.

REFERENCES:
patent: 4069462 (1978-01-01), Dunn
patent: 4191976 (1980-03-01), Braun
patent: 4365211 (1982-12-01), Lee
patent: 4404530 (1983-09-01), Stryer
patent: 4787097 (1988-11-01), Rizzo

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