Re: Problems with SPICE models from vendors

zineddine.zidane_at_gmail.com
Date: 03/25/05 

Date: 25 Mar 2005 09:40:55 -0800

hello folks, just saw your message about my Spice models. I did the
AD8605 model and would like to know what it is that you think isn't
working. I would prefer to see the test circuit you're using and
understand what you're trying to do. And if it really doesn't work,
then I owe you a pizza of your choice.

Helmut Sennewald wrote:
> "Robert Baer" <robertbaer@earthlink.net> schrieb im Newsbeitrag
> news:1PQ0e.3481$gI5.1145@newsread1.news.pas.earthlink.net...
> > The LM324 model from TI works fine,but the one from National
> > Semiconductor is junk.
> > I tried numerous Analog Devices models for various rail-to-rail
opamps,
> > and found that almost all i tried gave me the same kind of cryptic
square
> > root error.
> > Those tried: AD8605, AD531, AD541, AD8552, and the AD8571; the
only one
> > tried that did work was for the AD8614.
> > Now i would dearly like to have a set of models that were known
to work
> > (and more or less correctly), but i need to get a working AD8605
model.
> > The sets i have came from the manufacturer created in the latter
of
> > 1992, and thus are not quite up-to-date.
> > However, the model for the AD8605 was downloaded via the web just

> > yesterday - implying the problem is not fixed.
> >
> > Can anyone help?
>
> Hello Robert,
> I don't believe that you really can judge the quality of these
> models as a beginner with SPICE simulations.
> I agree with you that most models have difficulties with convergence.
> Many of them are really over complicated and sometimes generated
> by stupid programs or "roboters" and not by engineers.
>
> I assume that the listed models will work with some tweaking
> of the convergence parameters.
>
> What simulator do you use?
> If it's LTspice then send me your files and I will make
> you a working example with your AD8605.
> I always want to see the schematic, because I know that
> people sometimes have errors in their circuit.
> One important thing is to have a DC path to ground(0).
>
>
> Best Regards,
> Helmut
> Moderator of the LTspice user group