Re: [Ngspice-devel] Support for MX ... delvt0=

[Dietmar W. <die...@ar...>]

Hi Lucas,

few correction to my own mail:
I know the PTM models and accept them as a nice test vehicle (used them 
often by own). And I know they stuck in a older bsim4 version - 4.2.
But since version 4.5 ongoing Berkeley has added the instance parameter 
delvto and so has ngspice too. From my opinion it makes more sense to 
change the "version" parameter in the model cards and make your tests 
with the higher version models.
We have had the discussion to update old version models to the features 
and bug-repairs of the actual version often here in the list (just now 
with the SC/SCA bug in 4.5). I want avoid this additional effort and 
spend them in more meaningful things.
If your concern is more to a more compatible and efficient MC 
implementation then you are free to contribute.

If you need help don't hesitate to contact me (off-line).
Dietmar


Am 03.12.2010 19:53, schrieb Lucas Brusamarello:
> Hello,
>
> First, I would like to congratulate and thank you all for the efforts
> on the ngspice project.
>
> I have some experience using HSPICE but recently I had license issues
> with the version in our university, so I started using NGSPICE. I am
> very impressed with the quality of NGSPICE and the set of features.
>
> My group works with modelling of process variability and reliability,
> aging issues etc. In this field it is very common to express process
> variations as Vt variations. So I made a small modification on the
> code to support delvt0 (as in HSPICE) as a variable during
> instantiation or it can be changed with alter in a Monte Carlo loop
> (BSIM4v2 only so far, because it is the model used by PTM). I am
> planning to start working NGSPICE so I would like to become a
> developer and share the changes in the code, which I believe will
> mostly be MC related stuff.
>
> I can as well send the changes as a patch diff'ed from the repository.
>
> Thanks.
> Lucas
>
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