Method and apparatus for integrated distribution function...

Details Method and apparatus for integrated distribution function... Method and apparatus for integrated distribution function...

2008-09-09

2008-09-09

Lau, Tung S (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

Reexamination Certificate

active

11291760

ABSTRACT:
Probability distribution functions (PDFs), of a periodic input data signal, can be used to provide eye-diagram information. An advantage of PDFs, over conventional approaches to eye-diagram collection, is that analog-to-digital conversion can be accomplished by the slicer of a receiver, provided the slicer can programmably change its threshold. A cumulative distribution function (CDF), at a particular phase of a desired eye-diagram, can be collected by having a receiver's slicer scan its threshold level. For each threshold level, a fixed number of symbols can be analyzed as follows to produce a CDF value: count the number of times a particular symbol value occurs. The derivative of a CDF can produce its PDF, where each PDF can represent a “slice” of a desired eye-diagram. For a non-periodic input signal, an eye diagram can still be formed so long as the percentage occurrence, of each symbol value, remains at least approximately the same.

REFERENCES:
patent: 2002/0196510 (2002-12-01), Hietala et al.
patent: 2006/0018374 (2006-01-01), Nelson et al.
http://mw1.merriam-webster.com/dictionary/record, p. 1.
http://www.merriam-webster.com/dictionary/phase, p. 1.

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