[SI-LIST] Re: Signals crossing power plane split
- From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- To: <fzanella@xxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 4 Dec 2003 07:23:08 -0800
Similar scenarios have been discussed in this forum - I think you'll
find quite a bit of info. in the archives. The subject fields were:
"Impact of gap on stripline"
"Current return path"
"Reference Plane"
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Fabrizio Zanella
Sent: Wednesday, December 03, 2003 1:31 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Signals crossing power plane split
I have a few nets which are routed on a dual stripline layer, on a
multilayer board, and these nets are referenced to ground on one side
and a power plane with several split voltages on the other side. The
signal layer, SIG LYR2, is 3 mils from the VCC plane and 8 mils from the
ground plane. The VCC plane is part of a BC layer, so it is 2 mils from
a ground plane on the other side of the signals on SIG LYR2. Both VCC
and GND planes are 1.3 mils thick. =20
=20
____________________________________ GND LYR1 =20
________ SIG LYR1
GND LYR1 to VCC LYR =3D 11 mils =20
_________ SIG LYR2
SIG LYR2 to VCC LYR =3D 3 mils
____________ gap ________________VCC LYR VCC LYR to
GND LYR2 =3D 2 mils
_____________________________________ GND LYR2
=20
The nets in question, on SIG LYR2, have to cross gaps in the VCC layer.
My question is, will the return current for these signals use GND LYR2
as a reference to get across the splits?
Thanks,
Fabrizio Zanella
Principal Hardware Design Engineer
Broadbus Technologies
fzanella@xxxxxxxxxxxx
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