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.

AND9075/D www.onsemi.com 3 Figure 3. Eye Diagram Test Setup Pulse Generator Oscilloscope Data DUT Clock The Pulse Generator is required to generate a random bit

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