Phase lock loop circuit with a subsidiary loop filter

Details Phase lock loop circuit with a subsidiary loop filter Phase lock loop circuit with a subsidiary loop filter

1991-09-19

1992-12-08

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 331 17, H03K 513, H03K 522

Patent

active

051701308

ABSTRACT:
A phase lock loop circuit comprising a charge pump circuit (13), a loop filter (14), and a voltage controlled oscillator (15), a subsidiary loop filter (20) connected to the charge pump circuit and the loop filter in a phase lock operation through first and second switching circuits (21) and (22). The loop filter comprises a filter capacitor (C1) and delivers a filtered signal to the voltage controlled oscillator. In the phase lock operation, the subsidiary loop filter reduces a charge duration and a discharge duration of the filter capacitor. As a result, a voltage of the filtered signal varies rapidly and the phase lock operation is carried out in high speed.

REFERENCES:
patent: 4007429 (1977-02-01), Cadalora et al.
patent: 4559505 (1985-12-01), Suarez et al.
patent: 4745371 (1988-05-01), Haine
patent: 4752749 (1988-06-01), Moger
patent: 4849663 (1989-07-01), Kunze et al.
patent: 4937536 (1990-06-01), Reinhardt et al.

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