[SI-LIST] Re: Impedance calculation of asymmetric coupled lines?

• From: "D G" <dgun@xxxxxxxxxx>
• To: si-list@xxxxxxxxxxxxx
• Date: Fri, 18 Oct 2002 07:23:21 +0800

```As I learn more about it, there are still two modes, but they are not strictly
even and odd.  I guess I was referring to the fact that the capacitances from
each line to ground will be different.

I found some interesting, but math-intensive papers that describe SPICE
modeling of assymetric coupled lines.  If anyone is interested, I can give them
here.

From: houfei chen <hfchen73@xxxxxxxxx>
> Zeven and Zodd is defined for coupled line together,
> one is for even signal input, the other is for odd
> signal input.
> Correct me if I am wrong, but I don't think there is
> Zeven for line 1 and Zeven for line 2.
>
> --- D G <dgun@xxxxxxxxxx> wrote:
> >
> > Fair enough.  What do I get out of an asymmetric
> > coupled line when I put a differential signal into
> > it?  How do I simulate this with transmission line
> > models?
> >
> >
> > From: Fred Balistreri <fred@xxxxxxxxxxxxx>
> > > If they are not electrically symmetrical then they
> > cannot be called
> > > differential so the definition does not apply.
> > >
> > > Best Regards,
> > >
> > > D G wrote:
> > > >
> > > > The calculation of differential and common-mode
> > impedances is well known for symmetric coupled
> > lines.  How about asymmetric coupled lines, where
> > Zeven for line1 is not equal to Zeven for line2?
> > > >
> > > > --
> > > > Daniel
> > > > ZZZ-dgun-ZZZ-@xxxxxxxxxxxxxxx
> > > > (remove the Z-'s to reply--they're what I do
> > when I read spam)
> > > >
> > > > --
> > > >
> >
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> > > --
> > > Fred Balistreri
> > > fred@xxxxxxxxxxxxx
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> > > http://www.apsimtech.com
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> > >
> >
> >
> >
> > --
> > Daniel
> > ZZZ-dgun-ZZZ-@xxxxxxxxxxxxxxx
> > (remove the Z-'s to reply--they're what I do when I
> >
> > --
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--
Daniel
ZZZ-dgun-ZZZ-@xxxxxxxxxxxxxxx
(remove the Z-'s to reply--they're what I do when I read spam)

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