Re: Problems with SPICE models from vendors

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

Date: 25 Mar 2005 11:59:26 -0800

Hello Helmut:
I got an email from a colleague informing of the problem and didn't see
your response on the board.

zineddine.zidane@gmail.com wrote:
> 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

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