Transcription of AND9075 - Understanding Data Eye Diagram …
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AND9075 - Understanding Data Eye Diagram …
Semiconductor Components Industries, LLC, 2015 June, 2015 Rev. 11 Publication Order Number: AND9075 /DAND9075/DUnderstanding data EyeDiagram Methodology forAnalyzing high SpeedDigital SignalsIntroductionThe data eye Diagram is a methodology to represent andanalyze a high speed digital signal. The eye Diagram allowskey parameters of the electrical quality of the signal to bequickly visualized and determined. The data eye Diagram isconstructed from a digital waveform by folding the parts ofthe waveform corresponding to each individual bit intoa single graph with signal amplitude on the vertical axis andtime on horizontal axis. By repeating this construction overmany samples of the waveform, the resultant graph willrepresent the average statistics of the signal and willresemble an eye. The eye opening corresponds to one bitperiod and is typically called the Unit Interval (UI) width ofthe eye Diagram . An ideal digital waveform with sharp riseand fall times and constant amplitude will have an eyediagram as shown in Figure 1 1.
AND9075/D www.onsemi.com 2 Figure 2. Typical High Speed Digital Signal with Eye Diagram Data Eye Diagram Fundamentals High Speed Digital Signaling
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