Adaptive charge pump for phase-locked loops

Details Adaptive charge pump for phase-locked loops Adaptive charge pump for phase-locked loops

1991-08-21

1993-05-04

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 331 1A, 331 17, 331 25, H03K 1700, H03L 700

Patent

active

052085465

ABSTRACT:
A method and apparatus for improving the performance of a phase-locked loop are disclosed. A phase error between two signals is sensed and a temporary increase in the bandwidth of the phase-locked loop is provided responsive to the sensed phase error. The phase-locked loop may comprise a charge pump and the temporary increase in the bandwidth of the phase-locked loop may comprise a temporary increase in charge pump current. An increase in phase-locked loop bandwidth is followed by a decrease in the bandwidth responsive to a decrease in phase error. The decrease in bandwidth may comprise a decrease in charge pump current.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway
patent: 4524333 (1985-06-01), Iwata et al.
patent: 4885554 (1989-12-01), Wimmer
patent: 4890072 (1989-12-01), Espe et al.
patent: 4920320 (1990-04-01), Matthews
F. M. Gardener, Phaselock Techniques, 123-25 (1979).

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