[SI-LIST] : Package Parasitics Modelling

Daniel.Adar@ecitele.com
Mon, 29 Mar 1999 15:26:35 +0300

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: Daniel.Adar@ecitele.com

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