PLL circuit and method of controlling the same

Details PLL circuit and method of controlling the same PLL circuit and method of controlling the same

1999-08-23

2000-12-19

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331 45, 331 57, 331173, 327142, 327156, H03B 506, H03L 706

Patent

active

061632244

ABSTRACT:
A PLL circuit detects oscillation halt of a voltage control oscillator, generates an oscillation control signal for automatically oscillating the voltage control oscillator based upon the detected signal, and automatically restores the voltage control oscillator to a normal oscillation state by the use of the generated signal. The voltage control oscillator is structured by a ring oscillator in which a plurality of differential amplifiers are connected in a ring form. A plurality of oscillation control means are arranged for the respective inputs of the differential amplifiers so as to set the ring oscillator into an oscillationable state when the voltage control oscillator halts. The oscillation control means is controlled by the oscillating control signal.

REFERENCES:
patent: 5355097 (1994-10-01), Scott et al.
patent: 5596302 (1997-01-01), Mastrocola et al.
patent: 5767748 (1998-06-01), Nakao
patent: 5796313 (1998-08-01), Eitan
patent: 5905759 (1999-05-01), Ishida et al.
patent: 6066988 (2000-05-01), Igura

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