[SI-LIST] Re: Even/Odd mode impedance

[whiz kid <we_r_frendz@xxxxxxxxx>]

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
> >
>
------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe'
> in the Subject field
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the
> Subject field
> >=20
> > List archives are viewable at:
> > http://www.freelists.org/archives/si-list=20
> > Old list archives are viewable at:
> http://www.qsl.net/wb6tpu
> >  =20
> >=20
>
------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in
> the Subject field
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the
> Subject field
> 
> List archives are viewable at:    
> http://www.freelists.org/archives/si-list 
> Old list archives are viewable at:
> http://www.qsl.net/wb6tpu
>   
> 


__________________________________________________
Do You Yahoo!?
Get personalized email addresses from Yahoo! Mail - only $35 
a year!  http://personal.mail.yahoo.com/
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     http://www.freelists.org/archives/si-list 
Old list archives are viewable at: http://www.qsl.net/wb6tpu

• References:
  • [SI-LIST] Re: Even/Odd mode impedance
    • From: Michael Allen

Other related posts:

[SI-LIST] Even/Odd mode impedance

[SI-LIST] Re: Even/Odd mode impedance

[SI-LIST] Re: Even/Odd mode impedance

[SI-LIST] Re: Even/Odd mode impedance

[SI-LIST] Re: Even/Odd mode impedance