Using Differential Pairs in Allegro PCB Editor
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Layer name Indicates the ETCH/CONDUCTOR layer for which you are running the
calculation. By default, the TOP/SURFACE layer appears.
Differential
impedance
Specifies the impedance of the differential pair. It is calculated for a pair of
lines having the specified Line width and Primary gap on the layer.
Single-line
impedance
Indicates the impedance of one line of etch on the selected layer. Changing
this value automatically recalculates the Line width field. Each time the Line
width field in this calculator changes—either when you directly modify it or
when you select it to be recalculated—this value is also recalculated.
Line width Specifies the minimum width of each line of the differential pair. Changing
this value automatically recalculates the Single-line impedance field.
Changing the Single-line impedance field automatically recalculates this
value.
Primary gap Indicates the ideal edge-to-edge spacing between the pair that should be
maintained for the entire length of the pair.
