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Creating differential pairs with non-standard terminations

Question asked by pldenc44 on Nov 11, 2014
Latest reply on Nov 12, 2014 by pldenc44


I am using a termination technique that is not one of the two automatically recognized techniques in CES to create electrical nets and differential pairs. I have a differential par going to a 100 ohm terminating resistor, but then each side is AC-coupled into the receiver pin with a series capacitor. CES looks at this termination and groups all four physical nets into a single electrical net! It is actually an electrical net made up of two differential pairs. I can separate the four nets out by designating some of them as "analog", but then I'm unable to use them in a differential pair since they're "analog".

 

Any ideas on defining electrical nets and differential pairs when the termination topology is not automatically recognized?

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