Many thanks dear Andy for detailed response.
I have made it work following your guidelines. I have done the
following, not sure if it is the right way to compile only the modules
required, not the full set of modules:
cd gnucap-2009-12-07/models-spice3f5/bjt
make
then I copied the bjt.so file to the directory in which I have the
circuit file
I loaded the library:
gnucap> load ./bjt.so
Q: already installed, replacing
stashing as Q:0
npn: already installed, replacing
stashing as npn:0
pnp: already installed, replacing
stashing as pnp:0
npn1: already installed, replacing
stashing as npn1:0
pnp1: already installed, replacing
stashing as pnp1:0
gnucap> get LVDS-TTL-interface.cir
LVDS TTL interface by PY2WM
gnucap>
gnucap> print tran v(2) v(4)
gnucap> tran 0.1n 50n
#Time v(2) v(4)
0. 0.85 4.2814
100.p 1.55 4.1288
200.p 1.55 0.96156
300.p 1.55 0.31304
400.p 1.55 0.23195
500.p 1.55 0.24185
600.p 1.55 0.23245
700.p 1.55 0.20509
800.p 1.55 0.18063
900.p 1.55 0.17625
1.n 1.55 0.19033
1.1n 1.55 0.20642
1.2n 1.55 0.20952
1.3n 1.55 0.19855
1.4n 1.55 0.18501
1.5n 1.55 0.18119
1.6n 1.55 0.18946
1.7n 1.55 0.20162
1.8n 1.55 0.20731
1.9n 1.55 0.2029
2.n 1.55 0.191
2.1n 1.55 0.19825
2.2n 1.55 0.19598
2.3n 1.55 0.19343
2.4n 1.55 0.20056
2.5n 1.55 0.18954
2.6n 1.55 0.20379
2.7n 1.55 0.18734
2.8n 1.55 0.2051
2.9n 1.55 0.18714
3.n 1.55 0.20446
3.1n 1.55 0.18875
3.2n 1.55 0.20227
3.3n 1.55 0.19158
3.4n 1.55 0.19924
3.5n 1.55 0.19485
3.6n 1.55 0.19621
3.7n 1.55 0.19774
3.8n 1.55 0.19388
3.9n 1.55 0.19966
4.n 1.55 0.19272
4.1n 1.55 0.20032
4.2n 1.55 0.19284
4.3n 1.55 0.19977
4.4n 1.55 0.19402
4.5n 1.55 0.19838
4.6n 1.55 0.19579
4.7n 1.55 0.19667
4.8n 1.55 0.1976
4.9n 1.55 0.1952
5.n 1.55 0.19893
5.1n 1.55 0.1944
5.2n 0.85 -0.13994
5.3n 0.85 -0.021841
5.4n 0.85 0.038978
5.5n 0.85 0.079093
5.6n 0.85 0.094834
5.7n 0.85 0.11366
5.8n 0.85 0.12116
5.9n 0.85 0.1194
6.n 0.85 0.12327
6.1n 0.85 0.12556
6.2n 0.85 0.12698
6.3n 0.85 0.12816
6.4n 0.85 0.12906
6.5n 0.85 0.12507
6.6n 0.85 0.12974
6.7n 0.85 0.12586
6.8n 0.85 0.13014
6.9n 0.85 0.12699
7.n 0.85 0.13038
7.1n 0.85 0.1286
7.2n 0.85 0.13061
7.3n 0.85 0.13081
7.4n 0.85 0.13116
7.5n 0.85 0.13387
7.6n 0.85 0.13293
7.7n 0.85 0.14006
7.8n 0.85 0.14247
7.9n 0.85 0.34613
8.n 0.85 0.88974
8.1n 0.85 1.6287
8.2n 0.85 2.0306
8.3n 0.85 2.3938
8.4n 0.85 2.7543
8.5n 0.85 3.0696
8.6n 0.85 3.3279
8.7n 0.85 3.5341
8.8n 0.85 3.6993
8.9n 0.85 3.8339
9.n 0.85 3.9451
9.1n 0.85 4.0361
9.2n 0.85 4.1078
9.3n 0.85 4.1611
9.4n 0.85 4.199
9.5n 0.85 4.2264
9.6n 0.85 4.2485
9.7n 0.85 4.2689
9.8n 0.85 4.2885
9.9n 0.85 4.3057
10.n 0.85 4.3186
10.1n 1.55 4.1344
10.2n 1.55 0.99845
10.3n 1.55 0.31618
10.4n 1.55 0.24518
10.5n 1.55 0.18808
10.6n 1.55 0.16927
10.7n 1.55 0.18742
10.8n 1.55 0.21575
10.9n 1.55 0.22626
11.n 1.55 0.21206
11.1n 1.55 0.18886
11.2n 1.55 0.17744
11.3n 1.55 0.18512
11.4n 1.55 0.2071
11.5n 1.55 0.19352
11.6n 1.55 0.19835
11.7n 1.55 0.20205
11.8n 1.55 0.1907
11.9n 1.55 0.20852
12.n 1.55 0.18594
12.1n 1.55 0.21151
12.2n 1.55 0.18502
12.3n 1.55 0.21057
12.4n 1.55 0.18786
12.5n 1.55 0.20628
12.6n 1.55 0.19345
12.7n 1.55 0.2
12.8n 1.55 0.2002
12.9n 1.55 0.19346
13.n 1.55 0.20634
13.1n 1.55 0.18832
13.2n 1.55 0.2104
13.3n 1.55 0.1858
13.4n 1.55 0.21152
13.5n 1.55 0.18635
13.6n 1.55 0.20963
13.7n 1.55 0.18967
13.8n 1.55 0.20539
13.9n 1.55 0.19481
14.n 1.55 0.19997
14.1n 1.55 0.20044
14.2n 1.55 0.19475
14.3n 1.55 0.20524
14.4n 1.55 0.19094
14.5n 1.55 0.20816
14.6n 1.55 0.18933
14.7n 1.55 0.2087
14.8n 1.55 0.19014
14.9n 1.55 0.20694
15.n 1.55 0.193
15.1n 1.55 0.20351
15.2n 0.85 -0.14231
15.3n 0.85 -0.022093
15.4n 0.85 0.035938
15.5n 0.85 0.083438
15.6n 0.85 0.10343
15.7n 0.85 0.11467
15.8n 0.85 0.1245
15.9n 0.85 0.12788
16.n 0.85 0.12667
16.1n 0.85 0.12449
16.2n 0.85 0.12434
16.3n 0.85 0.12677
16.4n 0.85 0.13068
16.5n 0.85 0.12906
16.6n 0.85 0.12988
16.7n 0.85 0.13116
16.8n 0.85 0.12927
16.9n 0.85 0.133
17.n 0.85 0.12922
17.1n 0.85 0.13456
17.2n 0.85 0.12997
17.3n 0.85 0.13602
17.4n 0.85 0.1317
17.5n 0.85 0.13792
17.6n 0.85 0.13561
17.7n 0.85 0.14322
17.8n 0.85 0.15278
17.9n 0.85 0.43123
18.n 0.85 1.1791
18.1n 0.85 1.821
18.2n 0.85 2.2169
18.3n 0.85 2.6105
18.4n 0.85 2.9523
18.5n 0.85 3.2628
18.6n 0.85 3.489
18.7n 0.85 3.6946
18.8n 0.85 3.8374
18.9n 0.85 3.9698
19.n 0.85 4.0586
19.1n 0.85 4.1402
19.2n 0.85 4.1966
19.3n 0.85 4.2437
19.4n 0.85 4.282
19.5n 0.85 4.3058
19.6n 0.85 4.3345
19.7n 0.85 4.343
19.8n 0.85 4.3664
19.9n 0.85 4.3656
20.n 0.85 4.3853
20.1n 1.55 4.2156
20.2n 1.55 1.0442
20.3n 1.55 0.32282
20.4n 1.55 0.25686
20.5n 1.55 0.20011
20.6n 1.55 0.22197
20.7n 1.55 0.23369
20.8n 1.55 0.2219
20.9n 1.55 0.19755
21.n 1.55 0.18143
21.1n 1.55 0.18444
21.2n 1.55 0.19987
21.3n 1.55 0.212
21.4n 1.55 0.21091
21.5n 1.55 0.19237
21.6n 1.55 0.20586
21.7n 1.55 0.19825
21.8n 1.55 0.19968
21.9n 1.55 0.20444
22.n 1.55 0.19404
22.1n 1.55 0.20935
22.2n 1.55 0.19033
22.3n 1.55 0.21183
22.4n 1.55 0.1894
22.5n 1.55 0.21141
22.6n 1.55 0.1913
22.7n 1.55 0.20839
22.8n 1.55 0.19541
22.9n 1.55 0.2037
23.n 1.55 0.20059
23.1n 1.55 0.1986
23.2n 1.55 0.20552
23.3n 1.55 0.19436
23.4n 1.55 0.20905
23.5n 1.55 0.19198
23.6n 1.55 0.21043
23.7n 1.55 0.19191
23.8n 1.55 0.20947
23.9n 1.55 0.19405
24.n 1.55 0.20657
24.1n 1.55 0.19778
24.2n 1.55 0.20254
24.3n 1.55 0.20214
24.4n 1.55 0.1984
24.5n 1.55 0.20612
24.6n 1.55 0.1951
24.7n 1.55 0.20887
24.8n 1.55 0.19333
24.9n 1.55 0.2099
25.n 1.55 0.19337
25.1n 1.55 0.20914
25.2n 0.85 -0.14433
25.3n 0.85 -0.018908
25.4n 0.85 0.046426
25.5n 0.85 0.082641
25.6n 0.85 0.10003
25.7n 0.85 0.11086
25.8n 0.85 0.1229
25.9n 0.85 0.13022
26.n 0.85 0.12829
26.1n 0.85 0.13103
26.2n 0.85 0.13216
26.3n 0.85 0.13252
26.4n 0.85 0.1328
26.5n 0.85 0.13098
26.6n 0.85 0.13345
26.7n 0.85 0.13174
26.8n 0.85 0.13405
26.9n 0.85 0.13265
27.n 0.85 0.1347
27.1n 0.85 0.13392
27.2n 0.85 0.13549
27.3n 0.85 0.13583
27.4n 0.85 0.13666
27.5n 0.85 0.13893
27.6n 0.85 0.13984
27.7n 0.85 0.14722
27.8n 0.85 0.16968
27.9n 0.85 0.51178
28.n 0.85 1.29
28.1n 0.85 1.754
28.2n 0.85 2.1537
28.3n 0.85 2.578
28.4n 0.85 2.9599
28.5n 0.85 3.2755
28.6n 0.85 3.5259
28.7n 0.85 3.7163
28.8n 0.85 3.8878
28.9n 0.85 4.0087
29.n 0.85 4.1122
29.1n 0.85 4.1907
29.2n 0.85 4.2484
29.3n 0.85 4.3023
29.4n 0.85 4.3302
29.5n 0.85 4.3699
29.6n 0.85 4.3794
29.7n 0.85 4.4101
29.8n 0.85 4.4094
29.9n 0.85 4.4333
30.n 0.85 4.4283
30.1n 1.55 4.274
30.2n 1.55 1.0952
30.3n 1.55 0.33674
30.4n 1.55 0.26684
30.5n 1.55 0.20314
30.6n 1.55 0.17895
30.7n 1.55 0.18767
30.8n 1.55 0.21362
30.9n 1.55 0.19124
31.n 1.55 0.18523
31.1n 1.55 0.19653
31.2n 1.55 0.21176
31.3n 1.55 0.21688
31.4n 1.55 0.20912
31.5n 1.55 0.19964
31.6n 1.55 0.20292
31.7n 1.55 0.20579
31.8n 1.55 0.19734
31.9n 1.55 0.21062
32.n 1.55 0.19372
32.1n 1.55 0.213
32.2n 1.55 0.19286
32.3n 1.55 0.21251
32.4n 1.55 0.19479
32.5n 1.55 0.2095
32.6n 1.55 0.19885
32.7n 1.55 0.20489
32.8n 1.55 0.20391
32.9n 1.55 0.19992
33.n 1.55 0.20868
33.1n 1.55 0.19586
33.2n 1.55 0.21202
33.3n 1.55 0.19365
33.4n 1.55 0.21324
33.5n 1.55 0.19371
33.6n 1.55 0.21219
33.7n 1.55 0.19591
33.8n 1.55 0.20927
33.9n 1.55 0.19962
34.n 1.55 0.20529
34.1n 1.55 0.20389
34.2n 1.55 0.20125
34.3n 1.55 0.20774
34.4n 1.55 0.19809
34.5n 1.55 0.21034
34.6n 1.55 0.19646
34.7n 1.55 0.21123
34.8n 1.55 0.1966
34.9n 1.55 0.21041
35.n 1.55 0.19833
35.1n 1.55 0.20823
35.2n 0.85 -0.13829
35.3n 0.85 -0.025077
35.4n 0.85 0.048248
35.5n 0.85 0.086672
35.6n 0.85 0.10457
35.7n 0.85 0.11291
35.8n 0.85 0.12259
35.9n 0.85 0.13055
36.n 0.85 0.13497
36.1n 0.85 0.1357
36.2n 0.85 0.13422
36.3n 0.85 0.1327
36.4n 0.85 0.1324
36.5n 0.85 0.13316
36.6n 0.85 0.13406
36.7n 0.85 0.13454
36.8n 0.85 0.13611
36.9n 0.85 0.13525
37.n 0.85 0.13708
37.1n 0.85 0.13624
37.2n 0.85 0.13831
37.3n 0.85 0.13785
37.4n 0.85 0.14003
37.5n 0.85 0.14074
37.6n 0.85 0.14438
37.7n 0.85 0.15019
37.8n 0.85 0.29837
37.9n 0.85 0.74561
38.n 0.85 1.522
38.1n 0.85 1.9135
38.2n 0.85 2.2985
38.3n 0.85 2.7232
38.4n 0.85 3.0782
38.5n 0.85 3.3999
38.6n 0.85 3.6318
38.7n 0.85 3.8218
38.8n 0.85 3.9768
38.9n 0.85 4.1023
39.n 0.85 4.1973
39.1n 0.85 4.2628
39.2n 0.85 4.3144
39.3n 0.85 4.3631
39.4n 0.85 4.4019
39.5n 0.85 4.4252
39.6n 0.85 4.4419
39.7n 0.85 4.4558
39.8n 0.85 4.468
39.9n 0.85 4.4788
40.n 0.85 4.4875
40.1n 1.55 4.3273
40.2n 1.55 1.1408
40.3n 1.55 0.34243
40.4n 1.55 0.27132
40.5n 1.55 0.20765
40.6n 1.55 0.2362
40.7n 1.55 0.24506
40.8n 1.55 0.22431
40.9n 1.55 0.19815
41.n 1.55 0.20647
41.1n 1.55 0.21256
41.2n 1.55 0.19135
41.3n 1.55 0.22497
41.4n 1.55 0.18112
41.5n 1.55 0.23197
41.6n 1.55 0.17747
41.7n 1.55 0.23218
41.8n 1.55 0.18063
41.9n 1.55 0.22613
42.n 1.55 0.18922
42.1n 1.55 0.21582
42.2n 1.55 0.2007
42.3n 1.55 0.2041
42.4n 1.55 0.21208
42.5n 1.55 0.19394
42.6n 1.55 0.22064
42.7n 1.55 0.18763
42.8n 1.55 0.2246
42.9n 1.55 0.18635
43.n 1.55 0.22344
43.1n 1.55 0.18997
43.2n 1.55 0.21793
43.3n 1.55 0.19717
43.4n 1.55 0.2098
43.5n 1.55 0.20591
43.6n 1.55 0.20128
43.7n 1.55 0.21394
43.8n 1.55 0.19447
43.9n 1.55 0.21941
44.n 1.55 0.19088
44.1n 1.55 0.22124
44.2n 1.55 0.19111
44.3n 1.55 0.21934
44.4n 1.55 0.19476
44.5n 1.55 0.21452
44.6n 1.55 0.20067
44.7n 1.55 0.20824
44.8n 1.55 0.20721
44.9n 1.55 0.20215
45.n 1.55 0.21277
45.1n 1.55 0.19775
45.2n 0.85 -0.12329
45.3n 0.85 -0.020915
45.4n 0.85 0.046305
45.5n 0.85 0.090732
45.6n 0.85 0.11417
45.7n 0.85 0.12002
45.8n 0.85 0.1219
45.9n 0.85 0.12946
46.n 0.85 0.13108
46.1n 0.85 0.1333
46.2n 0.85 0.13499
46.3n 0.85 0.13548
46.4n 0.85 0.13704
46.5n 0.85 0.13603
46.6n 0.85 0.13807
46.7n 0.85 0.13649
46.8n 0.85 0.13898
46.9n 0.85 0.13724
47.n 0.85 0.13982
47.1n 0.85 0.13855
47.2n 0.85 0.14071
47.3n 0.85 0.14078
47.4n 0.85 0.14198
47.5n 0.85 0.14472
47.6n 0.85 0.1462
47.7n 0.85 0.16037
47.8n 0.85 0.34105
47.9n 0.85 1.0725
48.n 0.85 1.7907
48.1n 0.85 2.2304
48.2n 0.85 2.6501
48.3n 0.85 3.0353
48.4n 0.85 3.3584
48.5n 0.85 3.6216
48.6n 0.85 3.8371
48.7n 0.85 3.9944
48.8n 0.85 4.1245
48.9n 0.85 4.2239
49.n 0.85 4.2972
49.1n 0.85 4.3626
49.2n 0.85 4.3995
49.3n 0.85 4.4453
49.4n 0.85 4.4601
49.5n 0.85 4.4938
49.6n 0.85 4.4964
49.7n 0.85 4.5213
49.8n 0.85 4.5189
49.9n 0.85 4.5361
50.n 0.85 4.5337
gnucap>
Thanks
Ramiro.
El 20/07/11 04:25, al davis escribió:
On Tuesday 19 July 2011, Ramiro Aceves wrote:
I have a convergence problem:
Quick answer, based on experience, so I can give you an
immediate response ..
Convergence problems are often tied to the model used.
You are using the old "modelgen" BJT model, which will be phased
out.
Try instead to use the Spice BJT model from the spice models
tarball.
The modelgen models in gnucap (analogous to the spice "code-
models") check convergence by recursively checking the
subcircuit. This often results in overly critical checking,
where really everything is ok, but it indicates non-convergence.
Convergence checking in the spice models is less critical, so
often just switching to the other model will solve the problem.
Try this ..
get the plugin tarball
http://gnucap.org/devel/gnucap-2009-12-07-models-spice3f5.tar.gz
unpack it, compile the "bjt" model .. "load" it as a plugin.
More detailed response, for the curious ..
The modelgen models use an underlying subcircuit, and check
every part of it individually for convergence, the equivalent of
checking every state variable and the derivatives separately,
then a check pass checks all of the voltages node-to-node. To
accept, all must pass. This includes the internal nonlinear
capacitances, and all strays. The down side is that
occasionally one of the strays can get stuck on amplified
numerical noise and never be accepted, when in fact it could be
ignored.
Spice uses a quick check for convergence, where only a few
parameters are checked, as a composite. This method often
accepts incorrect values as converged, sometimes leading to
believable incorrect results.
Gnucap with the spice model is somewhere in the middle .. It
first uses the spice method, it's part of the model code, then
checks node-to-node voltages. The node-to-node check seems to
catch the false convergence problems.
Convergence handling is a big issue in simulator and model
design. There are trade-offs, impossible to really know what is
best in general.
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