Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Patent
1994-06-30
1997-06-24
Bocure, Tesfaldet
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
375360, H04L 700
Patent
active
056423861
ABSTRACT:
A data sampling circuit and method is provided for a burst mode communication system. The circuit is an entirely digital circuit for reliably sampling an incoming stream of data for automatically adjusting to variations in data stream clock rates and phase variations in the incoming data. The circuit includes a delay line, with a plurality of serially coupled taps, each tap having a variable delay. A first aspect of the invention includes increasing the delay time until the delay line captures at least one full data cell, but preferably two, of the incoming data stream (i.e., signal levels over at least one full clock period, defined by two transitions of the data stream), thereby aligning the receiving circuit with the frequency of the data stream clock. A second aspect of the invention includes outputting data from a tap that is selected to be midway between two regions of transitions of the incoming data stream, thereby aligning the receiving circuit with the phase of the data stream clock. The invention can, in alternative embodiments, track changes in the input data stream's phase/frequency. This involves updating the amount of delay in each tap of the delay line as well as picking the output of the appropriate tap to be used as the sampled data stream, in response to changes in the input signal as well as changes in propagation delays, of the circuits used to implement the delay line, resulting from temperature and voltage variations.
REFERENCES:
patent: 5063576 (1991-11-01), Eguchi et al.
patent: 5170415 (1992-12-01), Yoshida et al.
patent: 5251238 (1993-10-01), Menk et al.
patent: 5497374 (1996-03-01), Maruyama et al.
Bocure Tesfaldet
Massachusetts Institute of Technology
Webster Bryan
LandOfFree
Data sampling circuit for a burst mode communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data sampling circuit for a burst mode communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data sampling circuit for a burst mode communication system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-153961