Frequency difference detector with hysteresis

Details Frequency difference detector with hysteresis Frequency difference detector with hysteresis

2005-01-04

2005-01-04

Burd, Kevin (Department: 2631)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

Reexamination Certificate

active

06839394

ABSTRACT:
A scheme (e.g., one or more methods, circuits and/or architectures) for detecting the difference in frequencies between two periodic (e.g., clock) signals and/or for reliably assuring the frequency of an oscillating circuit (e.g., a voltage controlled oscillator [VCO], a phase locked loop [PLL] containing a VCO, etc.). The present invention is particularly useful for clock recovery in data communications devices and more particularly in asynchronous transfer mode (ATM) devices, such as SONET/SDH transmitters, receivers and/or transceivers.

REFERENCES:
patent: 5512860 (1996-04-01), Huscroft et al.
patent: 5764712 (1998-06-01), Branstad et al.
patent: 5774022 (1998-06-01), Griffin et al.
Cypress Preliminary CY7C955 AX™ ATM-SONET/SDH Transceive, Jul. 25, 1997, pp. 1-77.

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