Circuit arrangement for synchronizing an oscillator

Details Circuit arrangement for synchronizing an oscillator Circuit arrangement for synchronizing an oscillator

1989-03-10

1990-06-26

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 14, 331 25, H03L 710

Patent

active

049375385

ABSTRACT:
A synchronizing circuit arrangement including an oscillator and a low-pass filter with a large time constant can be integrated in an integrated circuit, which filter has at least a switch arranged in series with a capacitor, because the switch is controlled by a periodical pulsatory control signal, which is derived from the oscillator signal, for a period of conductance which is many times shorter, at least a hundred times, than a period of the control signal. A hold circuit for holding and transferring the signal present across the filter during the period of conductance of the switch is connected to a proportional part of the filter, which hold circuit includes a second switch which is synchronous with the first switch.

REFERENCES:
patent: 4524333 (1985-06-01), Iwata et al.
patent: 4535358 (1985-08-01), Duijkers
patent: 4829268 (1989-05-01), Leuthold et al.
Lewis, D. J. L.; "Switched Capacitor Fitters for PLL"; Electronic Engineering; vol. 55, No. 677, May 1983, pp. 27, 28.

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