High frequency loss of signal detector

Details High frequency loss of signal detector High frequency loss of signal detector

2007-08-28

2007-08-28

Patel, Jay K. (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S373000, C375S376000, C375S354000, C327S002000, C327S037000, C327S141000

Reexamination Certificate

active

10092166

ABSTRACT:
Methods and circuitry for implementing high speed loss-of-signal detectors for use in Gb/s telecommunication applications. The invention measures bit error rate (BER) of the incoming data by comparing the phase of the clock signal extracted from the incoming data with that of a delayed version of the incoming data. The results of this comparison are averaged over time to arrive at the BER. The measured BER is compared to a predetermined threshold value to detect a loss-of-signal condition. The invention adjusts the amount of delay of the incoming data in such a manner as to minimize the capacitive loading on the data line and clock line introduced by the loss-of-signal circuitry.

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Alexander Gilman et al., “Monolithic Clock and Data Recovery Chip for 10Gb/s Fiber Communication Systems,”Final Report 1999-2000 for MICRO Project 99-078, Industrial Sponsor: Conexant Systems, Department ofElectrical and Computer Engineering, University of California, Santa Barbara, California USA.
Richard C. Walker, et al., “A 2.488 GB/s Si-Bipolar Clock and Data Recovery IC with Robust Loss of Signal Detection,”HP Design Conference, Tokyo, 1997, Hewlett Packard Laboratories, Palo Alto, California USA.
Richard C. Walker, et al., “A 2.488 Gb/s Si-Bipolar Clock and Data Recovery IC with Robust Loss of Signal Detection,”HP Design Conference, Tokyo 1997, Hewlett Packard Laboratories, Palo Alto, California.

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