Phase/frequency detector and phase lock loop circuit

Details Phase/frequency detector and phase lock loop circuit Phase/frequency detector and phase lock loop circuit

2005-02-15

2005-02-15

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S025000, C331SDIG002, C327S012000

Reexamination Certificate

active

06856202

ABSTRACT:
The present invention relates to cycle slip detectors for phase and frequency detectors (PFD) and to lock detectors for phase lock loop (PLL) circuits. The present invention provides a cycle slip detector circuit for use with a phase and frequency detector circuit having first and second signal inputs, and arranged to provide first and second PLL control signal outputs responsive to clock edges in the first and second input signals respectively; the cycle slip detector circuit comprising: means for determining a cycle slip between said input signals by determining when a delayed output signal coincides with a respective input signal.

REFERENCES:
patent: 4902920 (1990-02-01), Wolaver
patent: 6256362 (2001-07-01), Goldman
patent: 6265902 (2001-07-01), Klemmer et al.
patent: 6404240 (2002-06-01), Hakkal et al.
patent: 6441691 (2002-08-01), Jones et al.
patent: 6466058 (2002-10-01), Goldman
patent: 20020126787 (2002-09-01), Homol et al.

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