[SI-LIST] Re: R: 2 layers PCB with no Plane(gnd or Power)
- From: <Aubrey_Sparkman@xxxxxxxx>
- To: <gianguida@xxxxxxxx>, <mohaghtalab@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 4 Aug 2008 10:14:38 -0500
I've been waiting for someone to suggest doing a co-planar waveguide
analysis. This is a valid way to make a transmission line in a single
layer....
Aubrey Sparkman
Enterprise Engineering Signal Integrity Team
Dell, Inc.
Aubrey_Sparkman@xxxxxxxx
(512) 723-3592
"There are no constraints on the human mind, no walls around the human
spirit, no barriers to our progress except those we ourselves erect." -
Ronald Reagan
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of gianguida@xxxxxxxx
Sent: Monday, August 04, 2008 7:24 AM
To: Mohamad Haghtalab; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] R: 2 layers PCB with no Plane(gnd or Power)
If you decide to use a 2 layer board
without ground or Power plane......
it means that you are assuming to not have signal integrity problems or
in other words you are assuming that your application is slow enough to
not require any particular attention to SI.
In this case simulation would just be an unecessary difficult and tricky
task (no one can know in advance where will be the return current...,
just to make an example) Easily this approach can lead to EMI
problems...
It would be much less costly
use a 4 layer board with good PWR/GND layers that find EMI/SI problems
when you'll measure the prototype...
Giancarlo
________________________________
Da: si-list-bounce@xxxxxxxxxxxxx per conto di Mohamad Haghtalab
Inviato: dom 03/08/2008 23.50
A: si-list@xxxxxxxxxxxxx
Oggetto: [SI-LIST] 2 layers PCB with no Plane(gnd or Power)
Hi all
How can we analyse(simulate) PCBs (transmission line effect ,calculatig
Z0(SI/EMI issues)...) with 2 routing layers and between them(signal
tracks)ground Islands(cupper fills...),what's the ground associate with
each signal track,how can we predict where the return current of each
signal will flow?
Thanks for helping
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