Coarse frequency detector system and method thereof

Details Coarse frequency detector system and method thereof Coarse frequency detector system and method thereof

2006-12-05

2006-12-05

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S011000, C331S023000, C331S025000, C327S049000

Reexamination Certificate

active

07145398

ABSTRACT:
An improved coarse frequency detector includes a first storage device responsive to a data signal and a sub-multiple of a clock signal for detecting a first transition in the data signal during a predetermined state of the sub-multiple of the clock signal and generating an intermediate signal, and a second storage device responsive to the data signal and the intermediate signal for detecting a second transition in the data signal having the same polarity as the first transition during the predetermined state of the sub-multiple of the clock signal and generating an up-pulse.

REFERENCES:
patent: 4308505 (1981-12-01), Messerschmitt
patent: 5648744 (1997-07-01), Prakash et al.
patent: 2004/0124929 (2004-07-01), Ishiwaki
D.G. Messerschmitt, “Frequency Detectors for PLL Acquisition in Timing and Carrier Recovery” IEEE Transactions on Communications, vol. 27(9), Sep. 1979, 1288-1295.
S.S. Paik, “The Design and Implementation of a New Wide Range Frequency Detector,” Master's Thesis, MTT, Jul. 28, 1998.

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