RE: [IBIS-Users] time step question

From: Lynne D. Green <lgreen22_at_.....>
Date: Fri Jun 22 2007 - 12:50:51 PDT
Hello, April,
 
The 0.0s times after 5ns clearly need to be removed.  There are also fewer
than 100 valid lines in the table.
This looks like a bug that should be reported to Ambrish Varma at NCSU.
 
The reason you see no steps between these two lines
2.93nS            1.4534V           1.2431V             1.6337V 
5.00nS            1.4534V           1.2457V             1.6337V 
is because s2ibis3 selects time points for best accuracy, instead of keeping
evenly spaced time points.
 
Best regards,
Lynne
 
 
"IBIS training when you need it, where you need it."
 
Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@mindspring.com
 
 


  _____  

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of April.Hachenburg@smsc.com
Sent: Friday, June 22, 2007 12:08 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] time step question



IBIS users, 
I have a questions regarding simulation time for the V-T curves.  I'm using
the s2ibis3 script with spectre to create my model.  When I used a
simulation time of 3.0ns, I noticed that one of the rising waveforms was
still settling under min. condition.  As a result, I increased the
simulation time.  When I did so, the simulations ran to about 3ns still,
then suddenly jumps to the final simulation time.  All the following values
revert to zero.  I've included an example below. 

Has anyone seen this issue?  If so, how do I resolve it? 

Thanks, 
April 




[Rising Waveform] 
R_fixture= 0.1500k 
V_fixture= 0.0 
V_fixture_min= 0.0 
V_fixture_max= 0.0 
|time     V(typ)              V(min)              V(max) 
|   
0.0S                1.1973mV          0.9612mV            1.4062mV 
50.51pS           1.2588mV          1.0489mV            1.4461mV 
0.10nS            1.4906mV          1.2259mV            1.5095mV 
0.15nS            1.9668mV          1.2757mV            1.8304mV 
0.20nS            1.8327mV          1.2233mV            2.6068mV 
0.25nS            1.6557mV          1.1725mV            2.5690mV 
0.30nS            1.4814mV          1.1666mV            1.9088mV 
0.35nS            0.8598mV          1.1546mV            1.0696mV 
0.40nS            0.4808mV          0.9128mV            0.5701mV 
0.45nS            0.3503mV          0.5327mV            0.4217mV 
0.51nS            0.2508mV          0.3639mV            0.4082mV 
0.56nS            0.1778mV          0.2484mV            0.4607mV 
0.61nS            0.1280mV          0.2066mV            0.7377mV 
0.66nS            0.1119mV          0.1626mV            0.8004mV 
0.71nS            0.1326mV          0.1308mV            -4.2468mV 
0.76nS            79.3558uV         86.8717uV           40.2760mV 
0.81nS            68.8351uV         55.0637uV           0.4070V 
0.86nS            0.1283mV          11.4705uV           1.0312V 
0.91nS            -0.5143mV         -17.7110uV          1.4799V 
0.96nS            -4.6066mV         -52.9933uV          1.6007V 
1.01nS            -13.5297mV        -87.7087uV          1.6237V 
1.06nS            11.9615mV         -0.1011mV           1.6280V 
1.11nS            0.1830V           -0.1240mV           1.6301V 
1.16nS            0.4741V           -0.1881mV           1.6306V 
1.21nS            0.8229V           -0.2977mV           1.6308V 
1.26nS            1.1539V           -0.4366mV           1.6314V 
1.31nS            1.3391V           -0.5495mV           1.6322V 
1.36nS            1.4080V           -0.6636mV           1.6325V 
1.41nS            1.4325V           -0.8265mV           1.6328V 
1.46nS            1.4405V           -1.0689mV           1.6329V 
1.52nS            1.4472V           -1.4895mV           1.6330V 
1.57nS            1.4499V           -3.2821mV           1.6331V 
1.62nS            1.4511V           -8.6506mV           1.6332V 
1.67nS            1.4518V           -17.2909mV          1.6333V 
1.72nS            1.4521V           -21.9207mV          1.6333V 
1.77nS            1.4522V           -25.7696mV          1.6334V 
1.82nS            1.4522V           -20.9140mV          1.6334V 
1.87nS            1.4522V           20.9336mV           1.6334V 
1.92nS            1.4523V           36.7265mV           1.6334V 
1.97nS            1.4525V           0.1150V             1.6335V 
2.02nS            1.4527V           0.1640V             1.6335V 
2.07nS            1.4529V           0.2180V             1.6335V 
2.12nS            1.4530V           0.2661V             1.6335V 
2.17nS            1.4530V           0.3576V             1.6336V 
2.22nS            1.4531V           0.4671V             1.6336V 
2.27nS            1.4531V           0.5537V             1.6336V 
2.32nS            1.4532V           0.6729V             1.6336V 
2.37nS            1.4532V           0.8132V             1.6336V 
2.42nS            1.4532V           0.9478V             1.6336V 
2.47nS            1.4533V           1.0134V             1.6336V 
2.53nS            1.4533V           1.0858V             1.6336V 
2.58nS            1.4533V           1.1636V             1.6336V 
2.63nS            1.4533V           1.1870V             1.6337V 
2.68nS            1.4533V           1.2040V             1.6337V 
2.73nS            1.4533V           1.2175V             1.6337V 
2.78nS            1.4533V           1.2270V             1.6337V 
2.83nS            1.4534V           1.2327V             1.6337V 
2.88nS            1.4534V           1.2387V             1.6337V 
2.93nS            1.4534V           1.2431V             1.6337V 
5.00nS            1.4534V           1.2457V             1.6337V 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 
0.0S              NA                NA                  NA 




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Received on Fri Jun 22 12:51:30 2007

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