RE: [SI-LIST] : IBIS model gives numerous errors

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From: Stubbs, Jason (Jason.Stubbs@marconi.com)
Date: Tue Apr 17 2001 - 07:14:16 PDT


Andy,

I understand that the non-monotonicity is a result of the overall response,
and the ICX tool gives you an error in the form of:

Error: The sum of the minimum clamp curves and the pulldown curve is not
monitonic at voltage 2.22

As you'd expect there isn't a value in any of the tables at 2.22v, so it's
doing some interpolation, it's just a shame you can't view the combined
response curves within ICX.

I've tried to create a spreadsheet that combines the curves together, but
the 2nd question I posed along with the interpolation issue, it's proving to
be a little bit more difficult than expected.

Regards

Jason

> -----Original Message-----
> From: Ingraham, Andrew [mailto:Andrew.Ingraham@compaq.com]
> Sent: Monday, April 16, 2001 6:30 PM
> To: Si-List (E-mail)
> Subject: RE: [SI-LIST] : IBIS model gives numerous errors
>
>
> Also remember that non-monotonicity in one of the component tables of
> curves, does not mean non-monotonicity in the overall response.
>
> Are you getting errors, or warnings? You might be getting
> just warnings
> that the data in one or more tables is non-monotonic. Often
> you can ignore
> such warnings, because they tend to happen when you divide the total
> response into the four overlapping tables (one of them turns
> to "noise"
> where another dominates).
>
> It's much easier for a program to check for monotonicity of a
> single table,
> than to add up and check the total response (with tables
> whose points don't
> exactly line up, some interpolation is required).
>
> Regards,
> Andy
>
>
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