[SI-LIST] Re: Remove Ground underneath Differential signal is deserved or not?
- From: Ritchey Lee <leeritchey@xxxxxxxxxxxxx>
- To: jian@xxxxxxxxxx
- Date: Mon, 29 Jul 2002 09:06:40 -0700
Binchua,
You don't ever want to remove the ground plane from underneath a differnetial
pair. Many more negative side effects result than the alleged common mode
energy might ever cause.
Lee
Jian X. Zheng wrote:
> Hi, Binchuan:
>
> Removing the ground plane for differential pair will suppress the even mode.
> Basically, the even mode will not be propagating. Its energy will not be
> transmitted. The even mode signal, which is considered as noise, will be
> reduced in your circuit. Thanks!
>
> Best regards,
>
> -----------------------------------------------------------------------
> Jian-X. Zheng, Ph.D
> Zeland Software, Inc., 48890 Milmont Drive, 105D, Fremont, CA 94538, U.S.A.
> Tel: 510-623-7162, Fax: 510-623-7135, Web: http://www.zeland.com
> ---------------------------------------------------------------------
>
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of binchuan2000
> > Sent: Thursday, July 25, 2002 7:20 PM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Remove Ground underneath Differential signal is
> > deserved or not?
> >
> >
> >
> > I am confused that I read some book about remove Ground under
> > Differential could reduce the induced Current from Differential pair,
> > but the question is how we could control its impedance(Differential
> > impedance) although Differential doesn't reference to Ground. If I
> > follow this content to REMOVE Ground under Differential pair how
> > could I control its Zodd impedance and its Zdiff impedance. Does it
> > will generate any other problem and if it does, why some textbook
> > advise it?
> >
> > Remove Ground is worth or not for Differential signal ?
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Binchuan.Wang
> >
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