[SI-LIST] Re: ground planes at top / bottom layer
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: <olaney@xxxxxxxx>, <leeritchey@xxxxxxxxxxxxx>
- Date: Tue, 6 Jan 2009 12:32:50 -0700
Good point Orin. No one did.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of olaney@xxxxxxxx
Sent: Thursday, January 01, 2009 7:48 PM
To: leeritchey@xxxxxxxxxxxxx
Cc: bernd.schuster12@xxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: ground planes at top / bottom layer
"...had to be ground in order to pass EMI?" Did anyone actually make
that assertion?
Orin
On Thu, 1 Jan 2009 18:10:44 -0800 "Lee Ritchey"
<leeritchey@xxxxxxxxxxxxx> writes:
> To all of those who recommend ground layers on the outside of PCBs to
> control EMI, take a look at a PC mother board or the motherboard in
> the
> Xbox. They are 4 layer PCBs that have signals on both outside layers
> and
> the products in which they are shipped pass EMI standards.
>
> My guess is it is an RE.
>
> Lee Ritchey
>
>
> > [Original Message]
> > From: bernd schuster <bernd.schuster12@xxxxxxxxxxxxxx>
> > To: <si-list@xxxxxxxxxxxxx>
> > Date: 12/30/2008 12:27:11 PM
> > Subject: [SI-LIST] ground planes at top / bottom layer
> >
> > Hi,
> > I`ve one small question about the usage of ground planes at the
> top and
> > bottom layer. I thought it would be great to use them, but the
> atmel
> > evaluation boards (for example) do not use an ground plane on the
> top
> layer
> > or bottom layer. They use for example an 8 layer stack design
> (where
> layer 5
> > is a vcc plane and layer 2 is a ground plane).
> >
> > Are there any disadvantages of using ground planes at the top /
> bottom
> > layer? In my first 4-layer board I use ground planes at the top,
> bottom
> and
> > at the second layer. I connect them with a lot of vias.
> >
> >
> > best regards
> > Bernd
> >
> >
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