Eye diagrams provide instant visual data that engineers can use to check the signal integrity of a design and uncover problems early in the design process. Used in conjunction with other measurements such as bit-error rate, an eye diagram can help a designer predict performance and identify possible sources of problems.
TIP: The jumplink at the end of the EDN article is 404, but you can read this PDF from Tektronix for an even further analysis of the anatomy of an eye diagram.
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