Saturday, January 11, 2025

Return Path Design Rules - DRC Gotchas

The Design Rule

Note:  

Most designs should NOTinclude Not inAnyDifferentialPair in the Scope as shown.

This is a special case for the board used in this Return Path DRC feature review.

The example Rule shown above is targeting a specific Net Class.

You might want to set the Scope to target All

Gotcha 1

In Gotcha 1 the problem is the GND Via on the left has another signal routed between the flagged via and the GND Via.

Solution 1: Add another Via or Waive the Violation

Other Points of Interest:

Per online help

Exclude small areas of copper from flagging a violation by setting the required value (in sq. mils, 10 by default) of the PCB.Rules.ReturnPathIgnoreArea option in the Advanced Settings dialog.

That's it !


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