Multiple frequency digital phase locked loop

Details Multiple frequency digital phase locked loop Multiple frequency digital phase locked loop

1984-01-03

1986-03-04

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 375120, H03K 513, H03K 522, H03D 1300

Patent

active

045742430

ABSTRACT:
An improved multiple frequency digital phase-locked loop circuit is described. The improved digital phase-locked loops utilizes a single circuit to effect both phase and frequency adjustments. The multiple frequency digital phase-locked loop effects phase adjustments by selectively combining or subtracting a reference clock signal with a derived programmable clock signal thereby generating a composite digital phase-locked loop clock signal. The multiple frequency provides frequency adjustments by selectively adding or subtracting pulses from the composite clock signal at a rate determined by a programmably controllable clock signal. The improved multifrequency digital phase-locked loop is suitable for use as a tone detector with the addition of a lock detector wherein the phase-locked loop can be programmed for a plurality of known operating frequencies.

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patent: 4360788 (1982-11-01), Erps et al.
patent: 4374438 (1983-02-01), Crowley

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