Tristate phase-lock loop prevents false lock

Details Tristate phase-lock loop prevents false lock Tristate phase-lock loop prevents false lock

1986-12-22

1987-12-08

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 10, 375120, H03L 710

Patent

active

047120770

ABSTRACT:
A phase-lock loop includes a tristate phase detector, a filter and a voltage-controlled oscillator connected in a loop for regenerating clock signals in response to a sequence of data signals applied to the input terminal of the tristate phase detector and the loop. The tristate phase detector opens its output lead whenever a zero is applied to the input terminal of the loop. A resistor is interposed between the tristate phase detector and the loop filter to clamp excursions of a control signal, causing the filter to produce a consistent tuning control signal and forcing the voltage-controlled oscillator to oscillate at a frequency within a preselected frequency range independent of the ones density in the digital sequence applied to the input terminal of the loop.

REFERENCES:
patent: 4495473 (1985-01-01), Treise
patent: 4520319 (1985-05-01), Baker
patent: 4565975 (1986-01-01), Gegner et al.

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