Altium NEXUS Documentation

Working with the Impedance Design Rule on a PCB in Altium NEXUS

Created: March 23, 2017 | Updated: September 26, 2019
All Contents

Rule categorySignal Integrity

Rule classification: Unary

Summary

This rule specifies the minimum and maximum net impedance allowed. Net impedance is a function of the conductor geometry and conductivity, the surrounding dielectric material (the board base material, multi-layer insulation, solder mask, etc) and the physical geometry of the board (distance to other conductors in the z-plane).

All design rules are created and managed within the PCB Rules and Constraints Editor dialog. For a high-level view of working with the design rules system, see Constraining the Design - Design Rules. For detailed information regarding how to target the objects that you want a design rule to apply to, see Scoping Design Rules.

Constraints

Default constraints for the Impedance rule.Default constraints for the Impedance rule.

  • Minimum (Ohms) - the value for the minimum permissible net impedance.
  • Maximum (Ohms) - the value for the maximum permissible net impedance.

How Duplicate Rule Contentions are Resolved

All rules are resolved by the priority setting. The system goes through the rules from highest to lowest priority and picks the first one whose scope expression matches the object(s) being checked.

Rule Application

Batch DRC and during Signal Integrity analysis.

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