Re: [IBIS-Users] Requesting for some help / information regarding the use of IBIS in SI simulation.

Since the beginning of IBIS, the most accurate simulators would turn the
RLC package parasitics into a transmission line equivalent. In lieu of
any additional information it is the most reasonable thing to do, since
packages can be approximated as transmission lines.

Scott McMorrow
Teraspeed Consulting Group LLC
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(401) 284-1827 Business
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On 5/31/2011 7:59 PM, Ray Anderson wrote:
> If you are using extracted RLC data to manually set up the package model
> you can certainly make intelligent decisions on the topology of the
> model and the distribution of the RLC parasitics. However if you are
> depending on a simulator to read the data from a IBIS .pkg format file
> (or the [PIN] data) and set up a model for you then your results may
> differ from simulator to simulator.
>
> -Ray
> Xilinx Inc.
>
>
> -----Original Message-----
> From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
> Behalf Of Andrew Ingraham
> Sent: Tuesday, May 31, 2011 4:48 PM
> To: ibis-users
> Subject: Re: [IBIS-Users] Requesting for some help / information
> regarding the use of IBIS in SI simulation.
>
> Yes.
>
> I am usually tempted to start with an evenly distributed RLC model ...
> unless I have reason to think that the distribution is otherwise. For
> example, wirebonds might have most of the inductance and resistance,
> whereas the leadframe may have more capacitance, which might influence
> one to imbalance those factors unequally between die end and pin end.
> But without hard data to back it up, that is just guessing.
>
> Andy
>

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