[SI-LIST] Re: Where are IBIS models with SSO support ?
- From: "Sam Chitwood" <samchitwood@xxxxxxxxxxx>
- To: "'Scott McMorrow'" <scott@xxxxxxxxxxxxx>
- Date: Wed, 14 Jan 2009 12:15:08 -0600
It's in the slides...
Sam
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Scott McMorrow
Sent: Wednesday, January 14, 2009 8:57 AM
To: Sam Chitwood
Cc: 'David Lieby'; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Where are IBIS models with SSO support ?
Sam
As a point of clarification. You not only need the die PDS capacitance,
you also need the die PDS series resistance. The Q of the circuit is
dependent upon the series resistance in the PDS circuit. If this is not
modeled correctly, you will not see the correct resonance peaks, and
without knowing the resistance, it's not possible to perform an optimal
impedance match with the die.
regards,
scott
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
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(401) 284-1827 Business
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Sam Chitwood wrote:
> Hi everyone,
>
> David may be referring to my original BIRD95 case study presentation:
> http://www.vhdl.org/pub/ibis/summits/jan05/chitwood.pdf
> (Thanks David for the nice comments!)
>
> A follow-up SSO study on IBIS package model choices and example
> effectiveness of PCB decoupling:
> http://www.vhdl.org/pub/ibis/summits/oct06b/chitwood.pdf
>
> And finally, a thorough discussion of how to build the best possible IBIS
> package models for SSO applications:
> http://www.vhdl.org/pub/ibis/summits/feb08/chitwood.pdf
>
> And remember to ask the silicon vendor for the die PDS capacitance... :-)
>
> Thanks,
> Sam
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
> Behalf Of David Lieby
> Sent: Tuesday, January 13, 2009 4:27 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Where are IBIS models with SSO support ?
>
> Several years ago I saw a paper by someone (I have forgotten the name of
the
> author) that detailed the use of IBIS files in HSPICE to get an idea of
SSO
> in a system. The system is set up to use the current output and timing
from
> the IBIS file, along with some extrapolation for cross current, to get a
> result of the current usage of a switching output. Then several of them
are
> fed from a power bus with a feed that is set up to look like several
> adjacent power/ground connections to the board.
>
> Yes, there are a lot of people who are taken aback by this approach. On
the
> other hand, once you go through the exercise and calibrate the results
> across at least one existing system (lab measurements, ghastly), you have
> something that is within 10 percent of what you really will see when the
> system is built. It does take time and no one else will do the work or
> figure out what you really want.
>
> I kept a whole group of hardware engineers happy with this approach and
the
> results with real systems.
>
> Cheers,
> dav0
> David Lieby
>
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