[SI-LIST] Re: Differential pair impedance
- From: "Abe Riazi" <ARIAZI@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sat, 28 Sep 2002 09:41:08 -0700
Brandon Kemp Wrote:
>
> I had a trouble
> finding a definition of differential Z in my old textbook ("Analysis of
> Multiconductor Transmission Lines", Paul), although it is a good and
fairly
> thorough book. Instead of doing a full literature search at the library,
I
> went through the derivation myself. I've included it with an explanation
> for correlation with Innoveda's XFX Transmission Line Parameters.
>
> (See attached file: derivation.doc)
>
> Brandon Kemp
> EMC/SI Engineer
> Lexmark International, Inc.
>
Hi:
As indicated by "derivation.doc", the XFX generated
Transmission Line Parameters (.tlp) file does not directly output the
differential line impedance ( Z_diff ) but provides
the odd and even mode impedances ( Z_odd and Z_even).
The following relation is valid for a symmetrical pair:
Z_diff = 2 * Z_odd
Sometimes, it is also desirable to calculate the single ended impedance
( Z_se ) which is obtainable via:
Z_se = (2 * Z_even * Z_odd) / (Z_odd + Z_even)
Best Regards,
Abe Riazi
ServerWorks
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