Using Differential Pairs in Allegro PCB Editor
February 9, 2012 7 Product Version 16.5
The calculator is available in the Electrical Domain in Constraint Manager, from the
Electrical CSet > Routing > Differential Pair and Net > Routing > Differential Pair
worksheets.
To access the differential calculator, in the Primary Gap, Neck Gap, or +/- Tolerance cells,
do the following steps:
4. Right-click and choose Change from the pop-up menu.
5. Select the Calculator button.
Differential Impedance in Constraint Manager
Advanced Constraints can be used to view the Differential Impedance in Constraint
Manager.
A pre-defined constraint called DIFF_IMPEDANCE_RULE can be set up and added to
any worksheet. The constraint is added to the Net > Routing > Impedance worksheet. You
can add this constraint to any worksheet, or even add a new worksheet. For more
information on customizing worksheets, refer to the section Customizing Worksheets in
Allegro Constraint Manager User Guide.
