Phase-locked loop with tunable oscillator

Details Phase-locked loop with tunable oscillator Phase-locked loop with tunable oscillator

1999-07-30

2000-12-05

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 1A, 331 16, 331 17, 327156, 327159, H03L 7085, H03L 718

Patent

active

061572640

ABSTRACT:
A phased-lock loop is disclosed for capturing the frequency of the input signal by adjusting a tunable oscillator such that a zero-crossing detector detects a zero-crossing point of the input signal relative to a predetermined number of counts at a counter where a control logic increments a tuning counter to increase the frequency at the tunable oscillator while decrements the tuning counter to decrease the frequency in the tunable oscillator. The predetermined number of counts at the counter representing one period, a fraction of a period, or a multiple of a period of the frequency of the input signal. The control logic adjusts the count at the tuning counter until the tunable oscillator generates an internal frequency that captures the frequency of the input signal.

REFERENCES:
patent: 4280224 (1981-07-01), Chethik

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