Skew is defined as the difference in propagation delay between two or more signal paths.
Skew is of greatest concern between two conductors of a differential pair.
If both path lengths aren’t matched precisely, skew in a differential pair can lead to increased Insertion Loss, Impedance Mismatch, Crosstalk and EMI.
Low skew between multiple paths can be important in a parallel bus.
http://www.sabritec.com/technotes/PDF/High_Speed_Digital_Tutorial.pdf
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