Phase locked loop circuit

Details Phase locked loop circuit Phase locked loop circuit

1992-11-25

1994-08-02

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 10, 331 14, 331 17, 331 25, 348500, 348536, H03L 7107, H04N 504

Patent

active

053349547

ABSTRACT:
A phase control circuit for controlling the relative phase of periodic components of two logic signals having the same frequency, and one of which periodic components has a pulse-duty factor different from 50:50, said circuit includes a signal source which provides a control signal for regulating the relative phase of the periodic components of said logic signals. The control signal has a first value for phase relationships in a predetermined range of values and a second value for phase relationships outside said range of values. A phase lock detector detects the lock status of the periodic components of the logic signals. Another signal source provides a third logic signal having a periodic component having the same frequency as the periodic component of each of the two logic signals and a pulse width substantially wider than that of the two logic signals. A switch is actuated by the phase lock detector and applies the third logic signal to the signal source when the two logic signals are out-of-lock whereby the control signal has the first value when the two logic signals are phase locked and the second value when the two logic signal are not phase locked.

REFERENCES:
patent: 4156855 (1979-05-01), Crowley
patent: 4214260 (1980-07-01), van Straaten
patent: 4835610 (1989-05-01), Dieterle et al.

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