[SI-LIST] Re: Mixed-mode impedance matrix
- From: "Zhou, Xingling \(Mick\)" <xlzhou@xxxxxxxxx>
- To: "Scott McMorrow" <scott@xxxxxxxxxxxxx>
- Date: Thu, 29 Jun 2006 16:05:09 -0400
Scott,
Thanks for your advice.=20
However, as I asked, does this mathematical operation tell us anything?
For example, can we even say,
Vdd=3DZss*Idd? By looking into the mixed mode S-matrix, I doult the
equation is true in general. If so, is it meaningful by doing the math?
And how can we apply it to designs?
Mick
-----Original Message-----
From: Scott McMorrow [mailto:scott@xxxxxxxxxxxxx]=20
Sent: Thursday, June 29, 2006 3:30 PM
To: Zhou, Xingling (Mick)
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Mixed-mode impedance matrix
Mick
If you want pure differential Z then all you need to do is to convert
the mixed mode S-parameters from the differential/differential quadrant
to a Z matrix.
Scott
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
Teraspeed(r) is the registered service mark of Teraspeed Consulting
Group LLC
Zhou, Xingling (Mick) wrote:
> Hi,gurus,
>
> I was asked to simulate differential Z. It was obviously motivated by=20
> 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=20
> year.
> As we know, the mixed-mode S parameter theory is well-establised=20
> (generalized by Andrea Ferrero in 2005). However, I don't know any=20
> mixed mode Z.=3D20
>
> 1. Some engineers do the so-called pure mode conversion, either diff=20
> 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=20
> reference impedance to do any S-Z converison, what is it for the d-c=20
> part?
>
> What is the latest development in theory other than some personal=20
> 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=20
> into Z, not piece by piece (so-called pure mode conversion). Otherwise
> the information is incomplete?
>
> Thanks,
>
> Mick
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