Phase-frequency lock detector

Details Phase-frequency lock detector Phase-frequency lock detector

1997-06-23

1999-02-09

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 8, 331 25, 331DIG2, 327156, H03L 7095

Patent

active

058700021

ABSTRACT:
A method and circuitry for detecting when a PLL achieves phase and frequency-lock to a reference frequency with minimal hardware and power dissipation are disclosed. The invention takes advantage of existing blocks within a PLL to reduce the amount of circuitry required while at the same time reducing error due to mismatch. In one embodiment, the present invention combines a coarse lock-detect circuit with a fine lock-detect circuit to achieve fast response when the input reference is lost, while filtering occasional minor phase hits due to external or internal noise.

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