Sunday, 8 April 2018

Altium : How to design a width rule for a subset of a net?


On my current design, I want to set a width rule for some nets which provide power in order to get them fatter. I set a net class on the net,set a rule and it works pretty well.



Now, this net is also used as an input on a ADC pin of a microcontroler. The first thing is that I don't need a fat connenter image description hereection for this purpose, the second is that there's no way to connect a fat line to only one pin on the microcontroler.


Is there a way to exclude a part of the net class from the rule ? Or a specific rule but based on which information ?


Here are two screenshots for illustration purpose.


enter image description here


enter image description here



Answer



Three approaches:



  • Use a net-tie: A net tie will create two distinct nets (each has its own name) but they are actually joined. Information on how to create & use a net tie can be found here.

  • Use a 0R resistor. Again, this will create an additional net.


  • Scope your rules so that they target only specific areas. You can either target your rule to only apply within a specific room or within specific coordinates on your board.


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