[SI-LIST] Re: 2 layers PCB with no Plane(gnd or Power)
- From: "Jon Keeble" <jkeeble@xxxxxxxxxxxx>
- To: "Mohamad Haghtalab" <mohaghtalab@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 4 Aug 2008 08:28:38 +1000
The easy answer is "that's why we use planes".
In the absence of planes the distribution of power becomes an issue.
Answering you question requires consideration of edge speeds, distances, shape
of copper structures, type of signalling (single ended / differential), EMI and
ESD emissions and immunity, and circuit configuration, just to start.
If you are building a low volume product then the additional engineering
required to dispense with extra layers may not be economic. If you are building
a high volume product then I suggest you pay an engineer to review your design.
Regards
Jon Keeble
----- Original Message -----
From: Mohamad Haghtalab
To: si-list@xxxxxxxxxxxxx
Sent: Monday, August 04, 2008 7:50 AM
Subject: [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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