[SI-LIST] Re: Differential pair impedance

Hello Bill,

This application note has some definitions for you:

www.polarinstruments.com/support/cits/AP157.html

Printer friendly..

www.polarinstruments.com/support/cits/AP157.pdf

Typically the impedance of one of a pair of lines when
they are driven differentially is the Odd mode impedance
or Zoo, and the impedance looking into the pair is the Differential
impedance sometimes Zdiff - this is twice the odd mode..

Kind regards
Martyn Gaudion
www.polarinstruments.com



At 02:37 26/09/2002, you wrote:

>Hello all,
>
>Im doing some work with differential pair signalling and the manufacturer's
>data book lists the charactoristic impedance for the differential pair.
>
>Is this number for each line of the pair, or the pair together?  If it is
>for the pair together, how are the calculations made?
>
>The documentation I found was fairly lean, so any help would be appreciated.
>
>Thanks,
>Bill
>
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