FreeLists / si-list / [SI-LIST] Re: Equations for creating twisted pair transmission lines?

[Scott McMorrow <scott@xxxxxxxxxxxxx>]

Tom

As Russell has stated, there is pretty much no way to create a twisted 
pair model from EM field solvers that will correlate with measurement.  
There are so many variations in the manufacture of cable and repetitive 
variations due to the process, that it truly takes measurement to 
determine the actual cable behavior.  in our work we have used VNA and 
TDR measurment based modeling approaches to create cable models.  I 
would suggest an approach using a TDR and TDA Systems iConnect, or an 
approach using a VNA with a sweep range from the 100 kHz to 1 GHz range 
and s-parameter modeling.  (HSPICE now does a reasonably good job of 
using Touchstone S-parameters in time domain simulation ... although it 
is slow)

regards,

scott

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Scott McMorrow
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