[SI-LIST] Mixed-mode impedance matrix

Hi,gurus,

I was asked to simulate differential Z. It was obviously motivated by
mixed mode S parameter theory. So strictly speaking, I need to convert
mixed-mode S to Z. I remember somebody asked the same question last
year.
As we know, the mixed-mode S parameter theory is well-establised
(generalized by Andrea Ferrero in 2005).  However, I don't know any
mixed mode Z.=20

1. Some engineers do the so-called pure mode conversion, either diff or
common modes. If so, what do we know about the c-d/d-c mode conversion?
Something is missing here? Of course, mathematically you can do it.
2. Is it possible or meaningful to define the mixed-mode Z? We need a
reference impedance to do any S-Z converison, what is it for the d-c
part?

What is the latest development in theory other than some personal
practices? I mean we need a solid foundation to do it. Any literature? I
think if the conversion can be defined, we must convert the whole S into
Z, not piece by piece (so-called pure mode conversion). Otherwise the
information is incomplete?

Thanks,

Mick
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