[SI-LIST] Re: Power Distribution Modeling Techniques
- From: "Ing. Giancarlo Guida" <gianguida@xxxxxxxx>
- To: ryan.satrom@xxxxxxxxxxx
- Date: Tue, 22 May 2007 16:40:37 -0100
Hi Ryan, regarding your question 5
there are specialized tools
for PDS simulation:
SI Wave from Ansoft.....
in additon you may want consider to visit
Sygrity
or Optimal
web site they both offer products and services in this field
Hope this help
ryansatrom ha scritto:
> All-
>
> I am interested in developing a better understanding of PDS modeling,
> but I'm really struggling to find good reference material to help
> me. To date, the best explanation of PDS modeling that I've seen is
> from Dr. Johnson's Black Magic Book. His book has helped me create a
> good general overview of PDS modeling, but I'm still unable to
> actually transfer his techniques to real-world board analysis.
>
> My other concern with Dr Johnson's book is that it may be out of
> date. The example he uses (see Ch.8) uses a Trise of 5ns
> (Fknee=3D100MHz). I am looking at 10GB/s board with a Trise of ~25ps.
>
> 1) Does anybody have any other recommended references for modeling
> Power Distribution?
>
> 2) At higher frequencies (5GHz+ instead of 100MHz), how do you
> ensure that the PDS maintains a low impedance. Is the solution just
> additional VCC-GND loops are required in the DUT area to further
> decrease the loop inductance of bypass network?
>
> 3) Are there any new strategies that are required for boards that
> are 5GHz+?
>
> I understand that at very high frequencies, the bypass is done
> through the VCC-GND planes. My assumption is that the high frequency
> signals are constrained to very close to the DUT area, therefore the
> planes-as-bypass is only valid in very small local area.
>
> 4) How can i quantify the effect of planes on the bypass network?
> Must I use 3D simulation to determine location of currents on planes?
>
> 5) What type of software is best for PDS simulation? What is
> recommended. I have access to HFSS, which helps with the very small
> environments. I'd like to learn to make do with what i have somehow.
>
> I'd appreciate any and all feedback. And again, maybe all of this is
> detailed in a reference book. Please let me know if you know of any
> good books on this topic as well. Thank you very much.
>
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