Tom Dagostino
-----Original Message-----
From: Christian S. Rode [SMTP:[email protected]]
Sent: Monday, March 29, 1999 11:16 AM
To: [email protected]
Subject: Re: [SI-LIST] : Package Parasitics Modelling
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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