[IBIS-Users] time step question

From: <April.Hachenburg_at_.....>
Date: Fri Jun 22 2007 - 12:07:57 PDT
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 12:08:58 2007

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