[SI-LIST] Re: C_comp in IBIS
- From: Brad Griffin <bgriffin@xxxxxxxxxxxx>
- To: jasonp@xxxxxxxxxxxxxxxxx
- Date: Fri, 8 Mar 2002 01:33:49 -0500
Hello Jason,
For specific information on how XTK removes the double counting,
feel free to contact me directly or utilize the Innoveda support
network (support@xxxxxxxxxxxx, http://www.innoveda.com/support/).
Regards,
Brad Griffin
Innoveda, Inc.
"Pritchard, Jason" wrote:
>
> Hello all-
>
> When creating an IBIS model from spice, the output rising and falling
> waveforms include the device i/o capacitance (c_comp). If this is a
> BI-directional model you would include C_comp to model the input
> capacitance
> and end up double counting the capacitance on the output. Is it
> neccessary
> to somehow isolate the output capacitance when creating the rising and
> falling waveforms?
>
> I found this note in the IBIS document:
> "All tables assume that the die capacitance is included.
> Potential numerical problems associated with processing the
> data using the effective C_comp for effective die capacitance
> may be handled differently among simulators."
>
> What is happening here? What does XTK do for example?
>
> Thanks,
> -Jason
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