[SI-LIST] Re: Thermal planes as reference planes?
- From: Ege Engin <engin@xxxxxxxxxx>
- To: james.f.peterson@xxxxxxxxxxxxx
- Date: Thu, 15 Apr 2004 10:15:39 +0200
Jim,
I would try to avoid using this plane as a reference plane due to
return-path discontinuities, which occur due to switching of the
reference plane at several points along the signal path. Such
discontinuities result in increased inductance at low frequencies and
power plane bounce at high frequencies.
An adjacent signal line is affected from this plane independent of
whether it is floating or tied to other planes. If you have a stripline
configuration, there are two reference planes, and the return current is
distributed on the planes inversely proportional to their distances from
the signal trace.
Ege
"Peterson, James F (FL51)" schrieb:
>
> Greetings,
>
> If we have a copper plane that is used for thermal relief and is not tied
> directly to digital ground, can it be used as a reference plane? Note : This
> thermal plane is tied to the chassis which has a single point connection to
> digital ground (located on the backplane).
>
> Will an adjacent signal layer see this as a reference plane?
>
> thanks, and regards,
> Jim Peterson
> Honeywell
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
> List technical documents are available at:
> http://www.si-list.org
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
-- Binary/unsupported file stripped by Ecartis --
-- Type: text/x-vcard
-- File: engin.vcf
-- Desc: Visitenkarte für Ege Engin
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
