Re: [SI-LIST] : Package Parasitics Modelling

Christian S. Rode ([email protected])
Mon, 29 Mar 1999 14:15:51 -0500

A question about IBIS input models. I assume a good portion of the input capacitance
of these models (C_comp) is associated with the input protection structures and that
there can be significant resistance between that capacitance and the pad. That's
not modeled in (earlier) IBIS models (and the EIA FAQ's "it's included
in the I-V characteristics" isn't relevant). 50 milliohms (or whatever) for R_pkg will
give an unnaturally high-Q for the input model. What would be a range of numbers for
R between the L and C? (I'm currently guessing 100 ohms)

Chris Rode

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