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Variability analysis is important in successfully deploying multi-gigabitbackplane printed wiring boards (PWBs) with growing numbers of high-speedSerDes links. We discuss the need for large sample sizes to obtain accuratevariability estimates of SI metrics (eye height, phase skew, etc).  Using a dataset of 11,961 S-parameters, we demonstrate statistical techniquesto extract accurate estimates of PWB SI performance variations. We citenumerical examples illustrating how these variations may contribute tounderestimated or overestimated design criteria, causing unnecessary designexpense. Tabular summaries of performance variation and key findings of broadinterest to the general SI community are highlighted.

PWB Manufacturing Variability Effects on High Speed SerDes Links: Statistical Insights from Thousands of 4-Port SParameter Measurements