[SI-LIST] Re: Even/Odd mode impedance
- From: whiz kid <we_r_frendz@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 12 Jun 2001 16:46:30 -0700 (PDT)
Hi Allen,
Do u have a url where I can directly go to the paper.
Thanks,
Rahul.
--- Michael Allen <mallen@xxxxxxxxxxxxxxx> wrote:
>
> Alexis,
> The odd mode impedance should be approximately
> equal to half of
> the differential impedance and the even mode should
> be as high as
> possible. TDA systems has a very good paper on the
> subject.
>
> Mike Allen
> Principal Engineer, Signal Integrity
> TeraConnect, Inc
> Nashua, NH
>
>
> > -----Original Message-----
> > From: Alexis LESTRA [SMTP:alestra@xxxxxxxxxx]
> > Sent: Tuesday, June 12, 2001 11:58 AM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Even/Odd mode impedance
> >=20
> >=20
> > Dear all,
> >=20
> > I am new in the field of signal integrity and
> would like to submit a=20
> > basic problem. I am currently designing a
> backplane for differential=20
> > signals at 2.5 Gbit/s. The receiver is
> differential, with 100 Ohm=20
> > termination. For coupled transmission lines, which
> characteristic=20
> > impedance should match 50 Ohm, the even-mode
> impedance or the
> > even-mode=20
> > impedance ? After reading some documentation on
> the topic, I am=20
> > confused. On one hand, I read that differential
> signals propagate in=20
> > odd-mode since coupled transmission lines are
> driven with equel=20
> > magnitude and 180=B0 out of phase ("High-speed
> Digital System =
> Design",=20
> > S.H. Hall, G.W. Hall, J.A. McCall, p.53) . On the
> other hand, I read=20
> > that since differential signals are launched from
> silicon devices,
> > the=20
> > gates that driver these signals are both
> referenced to ground,=20
> > resulting in even-mode coupling =20
> > (http://www.amp.com/simulation/files/papers/98060A
> 5.pdf p.19).
> > Can anyone help me to clarify this point.
> >=20
> > Thanks in advance.
> >=20
> > Alexis
> >=20
> > Alexis Lestra
> > Tachys Technologies
> > Les Algorithmes, Batiment Aristote A
> > 2000, route des Lucioles
> > F-06901 Sophia-Antipolis Cedex
> >=20
> >
>
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