Phase locked loop circuit with selectable variable frequency...

Details Phase locked loop circuit with selectable variable frequency... Phase locked loop circuit with selectable variable frequency...

2005-05-17

2005-05-17

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C331S00100A, C331S017000

Reexamination Certificate

active

06894571

ABSTRACT:
A PLL circuit comprises a reference signal generating unit for generating reference signals of different phases, variable frequency dividers for dividing the frequency of the output signal of a voltage-controlled oscillator (VCO) and thereby outputting feedback signals, and a phase comparator for comparing the phase of each feedback signal with that of the corresponding reference signal and thereby outputting phase comparison signals. When the output signal is synchronized with a preset frequency signal, at least one variable frequency divider of the variable frequency dividers is operated, and the operation of the other is stopped.

REFERENCES:
patent: 4868514 (1989-09-01), Azevedo et al.
patent: 4987387 (1991-01-01), Kennedy et al.
patent: 6148052 (2000-11-01), Bogdan
patent: 9-8655 (1997-01-01), None
patent: 10-135822 (1998-05-01), None
patent: 2001-267918 (2001-09-01), None

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