Robust phase-lock detector

Details Robust phase-lock detector Robust phase-lock detector

2008-06-17

2008-06-17

Lee, Benny (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C331SDIG002, C327S156000

Reexamination Certificate

active

07388441

ABSTRACT:
A robust phase-lock detector for a phase-locked loop examines both the sum frequency and baseband components of an error signal from the phase-locked loop to determine that both a reference signal and an output signal for the phase-locked loop are present and that the reference and output signals have a desired phase relationship. An IF detector selects the sum frequency component, which is the sum of the reference frequency and a subdivided frequency from the output signal, and detects its presence. A baseband detector selects the baseband component and detects whether the baseband component is approximately zero volts. The outputs from the IF detector and the baseband detector are combined to produce a lock signal, indicating that the phase-locked loop is locked, i.e., the reference and output signals are present and have the desired phase relationship with respect to each other.

REFERENCES:
patent: 6314150 (2001-11-01), Vowe
patent: 6396354 (2002-05-01), Murayama et al.

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