Using Differential Pairs in Allegro PCB Editor
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Primary Gap: Specifies the ideal edge-to-edge spacing between a pair of nets in the
differential pair that should be maintained for the entire length of the pair
Primary Width: Specifies the minimum width of each line of the differential pair
Neck Gap: Specifies the edge-to-edge spacing between nets of a differential pair as it
goes through tight areas
Neck Width: Specifies the minimum allowable width for a line in a differential pair as it
goes through tight areas
Coupled Tolerance (+): Specifies the allowable positive deviation from the Primary
gap for a differential pair to still be considered edge-coupled
Coupled Tolerance (-): Specifies the allowable negative deviation from the Primary
gap for a differential pair to still be considered edge-coupled
Minimum Line Spacing: A line-to-line check to make sure that the other settings are
not violated
