How to determine the critical length of a signal.

Ed.: The following is excerpted from the author’s new book titled High-Speed Constraint Values and PCB Layout Methods. The book and accompanying calculator give effective constraint values based on signal edge rate and stackup information. The book and calculator are available as free downloads at This excerpt presents Chapter 3, which describes the best way to determine if a routed signal needs high-speed management. Other chapters in the book describe the layout methods and constraints to prevent signal degradation.

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