Differential Impedance--What’s the Difference?:Just when you thought you had mastered Zo, the characteristicimpedance of a PCB trace, along comes a data sheetthat tells you to design for a specific differential impedance.And to make things tougher, it says things like: “… since thecoupling of two traces can lower the effective impedance, use50 Ohm design rules to achieve a differential impedance ofapproximately 80 Ohms!” Is that confusing or what!!This article shows you what differential impedance is.But more than that, it discusses why it is, and shows you how to make the correct calculations.
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