Issue link: https://resources.pcb.cadence.com/i/1532922
Differential pair rules Implement specific rules for differential pairs to ensure optimal signal propagation. This includes: f Dynamic phase tolerance: Allow for slight variations in differential pair length matching to account for manufacturing tolerances. f Static phase control: Set strict length matching requirements to minimize skew between the positive and negative signals. f Maximum uncoupled length: Specify the maximum length that differential pair traces can be routed separately before recoupling. Interestingly, the differential pair rules are split in which sheet we can use to constrain that differential pair (i.e. we can use Electrical Constraints or Physical Constraints). We recommend using the Electrical Constraint Set rules for Differential Pairs for Uncoupled Length, Static Phase Tolerance and Dynamic Phase, then use Physical Constraint sets for the other param- eters on that Differential Pair. As shown below, we set some differential pair rules in our Electrical Constraint set. Then in the Net section we can apply them. 51 www.cadence.com OrCAD X Constraint Management Guide