regards,
Larry Smith
Sun Microsystems
> From: [email protected]
> X-Lotus-FromDomain: ECI TELECOM
> To: [email protected]
> Date: Mon, 29 Mar 1999 15:26:35 +0300
> Subject: [SI-LIST] : Package Parasitics Modelling
> Mime-Version: 1.0
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>
> I made some spice simulations of package parasitics effect.
> I compared the RLC model of IBIS with an ideal Transmission line (with
> zo=sqrt(L/C) and Td=sqrt(L*C).
> In both cases I drove the package model (RLC or T line) by a pulse with various
> rise time, Tr.
> I'd like to share with you the results and conclusions:
> 1. For very small parasitics (whereTd<<Tr) the RLC gave similar results to those
> of the T line, but there was no need in any model since the effect was
> negligible.
> 2. For larger parasitics there is a significant difference between the two
> models.
>
> My conclusion is that referring the package parasitics simply as R,L and C is
> incorrect.
> It should always be modelled as a T line or skipped for small values!
>
> Does anyone like to comment on that?
>
>
>
>
> Daniel Adar
> e-mail: [email protected]
>
>
>
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