[SI-LIST] Re: Return current crosstalk?
- From: steve weir <weirsp@xxxxxxxxxx>
- To: zhang_kun@xxxxxxxxxx, patrick@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Fri, 02 Apr 2004 04:38:53 -0800
Zhangkun, that isn't quite right. For any reasonable plane thickness, the
skin effect of the plane so greatly reduces the current density in the
common loop that for digital signals it does not matter.
Steve.
At 06:20 PM 4/2/2004 +0800, Zhangkun wrote:
>Dear Patrick
>
>There will be no critical crosstalk problem. The signals in Layer 3 and 5
>has only resistive crosstalk and has not inductive crosstalk for there is
>no common loop.
>
>If the signal is of low frequency, there maybe some problem.
>
>Hope this will help.
>
>Best Regards
>
>Zhangkun
>2004.4.2
>----- Original Message -----
>From: "Patrick Jabbaz" <patrick@xxxxxxxxx>
>To: <si-list@xxxxxxxxxxxxx>
>Sent: Friday, April 02, 2004 3:56 AM
>Subject: [SI-LIST] Return current crosstalk?
>
>
> > All,
> > I have a Board stack-up that currently has a reference plane in the
> > middle,=20
> > Between two signal Layers
> >
> > L3 Int-sig1 Hor
> > L4 Plane
> > L5 Int-Sig2 Hor
> >
> > I normally would run adjacent signal layers at 90 degrees from each
> > other, not in this case.
> > Let's assume that I have signals running horizontal left to right on Int
> > Signal layer 3
> > I also have signals running horizontal (left to right) on Int Signal
> > layer 5
> > The signal traces lined up perfectly over each other.
> > With that in mind, my question is the following
> > Would the return currents cause cross-talk? Or would the return current
> > be=20
> > Riding only on the top and bottom surface of the reference plane without
> >
> > Interacting with one another?
> >
> > Inkra Networks
> > Patrick Jabbaz CID
> > Sr Board Layout Eng.
> > 40971 Encyclopedia Circle=20
> > Fremont, CA 94538
> > Work (510) 249-4835
> > Mobile (408) 621-6533
> > patrick@xxxxxxxxx
> >
> >
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Steve Weir
Teraspeed Consulting Group LLC
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