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S-parameters extraction for differential traces on multi-board project

Question asked by jchou on Dec 31, 2008
Latest reply on Jun 23, 2017 by cathy_terwedow


I have few questions regarding the use of S-paramters extraction for differential traces on multi-boards environments.



1. After PCB post-layout translation into Hyperlynx, the two traces in diferential modes are not associated with each other. How do I change that ? So far, I only can simulate it by enabling crosstalk simulation. But I am not sure if this is correct.



2. The differential trace impedance is 100 ohms. During S-parameter extraction, should I set the reference impedance to 100 ohms or 50 ohms ?



3. I change the spice simulator in HyperLynx from Eldo/ADMS to Hspice, and the resultant S-parameters do output  with some difference (2db on some frequencies).



   How can I tell which one is correct ? Any suggestions ?



4. For a connector on multi-board mating, the female connector is on one board while male connector is on another board. How do I use the connector model library on each board ? The connector model library is a result of both female and male connectors combined, not seperable, such as in EZ from Erni.