Subject: Re: [IBIS-Users] query to ibis forum
From: kesavp (kesavp@spikeindia.com)
Date: Mon Sep 29 2003 - 21:53:26 PDT
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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