Subject: RE: [IBIS-Users] FW: Extreme currents????
From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Wed Jul 10 2002 - 15:32:32 PDT
I don't think this is so much of an issue of how high the
tools can go as Lynne stated. A number is a number,
regardless of how high it is... (Aside from the precision
variations you run into depending on the number of bytes
used for the numbers).
The real problem in my opinion is that if you have a diode
that does this, it will clip an overshoot, which may be
different from what a real device does, and you will see
waveforms that are incorrect.
Arpad Muranyi
Intel Corporation
=============================================================
-----Original Message-----
From: Lynne Green [mailto:lgreen@cadence.com]
Sent: Wednesday, July 10, 2002 3:19 PM
To: Chris.Dewitt@motorola.com; ibis-users@eda.org
Subject: re: [IBIS-Users] FW: Extreme currents????
Hello, Chris,
Different EDA tools have different upper limits on currents that can be
handled
by the simulator.
The warning is needed because "Spice" models that use the default series
resistance (0.0 ohms) for diodes and junction leakage currents result in
large
IBIS table currents (often above 1 MegAmp). Most EDA tools don't go quite
_that_ high.
Best regards,
Lynne
-----Original Message-----
From: John Angulo [mailto:jangulo@innoveda.com]
Sent: Tuesday, July 09, 2002 6:02 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] FW: Extreme currents????
The following is forwarded on behalf of Chris DeWitt at Motorola TCG.
Please send all private replies to Chris.Dewitt@motorola.com.
John Angulo
IBIS Open Forum Postmaster
-----------------------------------
If I run IBISCHK3 on many models I download I get an "Extreme currents
present" warning.
What are the limits on currents in the VI tables? I can't find it
documented anywhere.
Thanks
Chris DeWitt
Principal Staff Engineer
Motorola TCG
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