A differential pair, universally used to transport all high-speed serial links and many other high-frequency busses, is really composed of two independent transmission lines. We can describe these two lines as either two single-ended transmission lines with crosstalk, or separately, but equally, as one single differential pair. Though any two single-ended transmission lines can make up a differential pair, two specific qualities make them particularly effective for high-speed digital communications. The first quality is symmetry between the two lines. Line widths, dielectric thicknesses and all other geometrical features should be the same. This will assure that there is minimal conversion of differential signals into common signals.
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