Phase locked signal generator to produce a clock signal in phase

Details Phase locked signal generator to produce a clock signal in phase Phase locked signal generator to produce a clock signal in phase

1994-06-09

1996-02-20

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 14, H03L 700

Patent

active

054932564

ABSTRACT:
A phase-locked signal generator which performs phase-locked control of the output of a triangular-wave VCO when a trigger signal is not inputted, and which performs, when the trigger signal is inputted, short interval suspension of oscillation of the triangular-wave VCO, and detection of a phase difference between the trigger signal and the reference clock signal by a successive phase measuring portion after the short interval by using the triangular-wave signal, thereby obtaining phase data. The measured phase data is held until the next trigger signal, and the phase of the triangular-wave VCO is controlled in accordance with the phase data so that the triangular-wave signal has a fixed phase with respect to the reference clock signal. A square-wave signal outputted from the triangular-wave VCO is used as the phase-locked clock signal. This makes it possible to generate the phase-locked clock signal at higher stability than a conventional circuit, and to improve jitter without using the multiplied frequency of the phase-locked clock signal.

REFERENCES:
patent: 3921095 (1975-11-01), Chu
patent: 4875108 (1989-10-01), Minuhin et al.

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