Auto-centered phase-locked loop

Details Auto-centered phase-locked loop Auto-centered phase-locked loop

1990-06-27

1992-06-02

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 17, 331 25, H03L 7093, H03L 710

Patent

active

051190435

ABSTRACT:
A multi-band processing system for automatically tuning the oscillator of a phase-locked loop to the frequency and phase of an applied input. The system includes an error detection circuit, a frequency controller, a scaling circuit, and a phase and frequency controller. The applied input and the oscillator output are coupled to the error detection circuit whose error output drives a charge pump/filter circuit. An error signal is derived from the difference between the loop charge pump output V.sub.1 and a preset charge pump zero error reference signal V.sub.ref, wherein the frequency controller regulates the oscillator output frequency according to a frequency error component of V.sub.1 -V.sub.ref, the scaling circuit scales the oscillator output frequency according to a system scaling signal N, and the phase and frequency controller adjusts the oscillator output frequency and phase according to V.sub.1 -V.sub.ref, when a 1/N multiple of the frequency of the oscillator output is compared in the error detection circuit to the frequency of the applied input.

REFERENCES:
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patent: 4568888 (1986-02-01), Kimura et al.
patent: 4593254 (1986-06-01), Coburn
patent: 4595886 (1986-06-01), Mroch et al.
patent: 4745372 (1988-05-01), Miwa
patent: 4811317 (1989-03-01), Barnard et al.
patent: 4829545 (1989-05-01), Guzik et al.

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