Subject: Re: [IBIS-Users] query to ibis forum
From: erik.van.der.ven@philips.com
Date: Tue Sep 30 2003 - 00:13:26 PDT
Hello Kesav,
I am not sure if I understand your problem. Are you using different time
steps for your min/typ/max tables? These values have to be put into one
table with a common "x-axis" (sweep range). So the time steps cannot be
different. I can understand that s2ibis is not ables to put these data
into one table in this case.
So I suggest that you find a region that covers the fast regions of all
three curves where you increase the datapoint density to a suitable value.
With kind regards,
Erik.
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
kesavp <kesavp@spikeindia.com>
Sent by:
owner-ibis-users@eda.org
09/30/03 06:53 AM
To: "Muranyi, Arpad" <arpad.muranyi@intel.com>
Erik van der Ven/NYM/SC/PHILIPS@EMEA2
cc: ibis-users@eda.org
Subject: Re: [IBIS-Users] query to ibis forum
Classification:
Hi Arpad/Eric,
Thank you for your suggestion. I changed the step size
manually at the region of fast rate of change in the ground clamp curves
maintaining the step sizes same for all the process corners (as mentioned
by Erik), it is working fine.
However when I tried the same on power clamp curves the s2ibis2 did not
read the power clamp data. This may have happened as the sweep ranges for
different process corners are different and the step sizes varies for
different process corners though I am maintaining the same step size at
the region of fast rate of change, but the extreme values of voltages
change hence in order to cover +Vcc to +2Vcc range for each process corner
I had to give different step sizes. May be because of this s2ibis2 may not
be finding the voltage ranges with the same step size (common for all the
three process corners).
Any suggestions on how to overcome this problem.
Thanking you,
--Kesav.
----- Original Message -----
From: Muranyi, Arpad
To: ibis-users@eda.org
Sent: Monday, September 29, 2003 9:29 PM
Subject: RE: [IBIS-Users] query to ibis forum
Kesav,
IBIS doesn't specify or recommend any voltage or time step size
for the tables. You need to decide on that for yourself.
However, note that you do not have to evenly space the points
along the x-axis in the tables. This is useful for making
smaller step sizes in the regions where your curves change
fast.
Be careful when you use s2ibis, if I am not mistake, it can
only give you evenly spaced x-axis for the tables.
Arpad Muranyi
Intel Corporation
==============================================================
-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On Behalf Of kesavp
Sent: Sunday, September 28, 2003 7:55 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] query to ibis forum
Hi IBIS experts,
I am interested to capture part of the VI curve (pullup,pulldown, ground
clamp and power clamp) range in small step size.
S2IBIS tool by default takes 0.05 or 0.1 V step size. I would like to know
does IBIS spec recommends any specific step size.
Could any one please let me know how to go about making VI curves for
small step size other than default value.
Thanks,
Kesav.
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