Subject: RE: [IBIS] IV curve question...
From: ruston, matt (ruston_matt@emc.com)
Date: Fri Nov 01 2002 - 10:32:36 PST
Andy:
Hi. The non-monotonicity is attributable to the separation of the various
clamp and pulldown curves. I added the clamp curves back in (in Excel) and
the curves looked normal.
Does anyone know of an easier way to combine these clamp currents back with
the pullup and pulldown curves? Any freeware utilities?
Regards,
Matt
-----Original Message-----
From: Ingraham, Andrew [mailto:Andrew.Ingraham@hp.com]
Sent: Thursday, October 31, 2002 2:14 PM
To: ruston, matt
Cc: ibis@eda.org
Subject: RE: [IBIS] IV curve question...
Matt,
I didn't know that the supply voltage was only 1.8V. Since in
your sketch the non-monotonic region begins around there, it
is possible that the non-monotonicity is related to the
separation of currents into pull-down and clamp I-V tables.
The spikeyness almost sounds like a simulator bug, especially
with the way you can affect the spike by changing Tstep.
Regards,
Andy
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