Re: gEDA-user: Problem with spice model in both ngspice and gnucap

["JERRY DUNMIRE" <jedunmire@xxxxxxxxx>]

Dan,
I played with the model a bit to see if I identify the problem. I thought that gnucap was accepting POLY(1) and not POLY(n), but based on your comments I'll guess that gnucap was treating POLY(1) as a  symbolic node. There are also TABLE sources in the file and I don't think gnucap likes those either.

Interestingly the spice models from Linear Technologies, for similar op-amps, seem to work (at least there are no errors reported) for gnucap. So maybe I'll select an opamp from Linear. The Linear spice models do not seem to use POLY or TABLE elements.

...jerry

On Thu, May 29, 2008 at 3:32 PM, Dan McMahill <dan@xxxxxxxxxxxx> wrote:

I'll let Al correct me if I'm wrong, but it seems to me that at this
point with gnucap plugins that it should be pretty easy to make a pspice
compatible poly source for gnucap.  The other possibility, although I
haven't dug out the right docs to know for sure, is that you can
translate that bit to something gnucap or ngspice does support.

JERRY DUNMIRE wrote:
> Thanks Al. I did notice the PSPICE recommendation, but since I haven't
> found many vendors providing models for ngspice or gnucap...
>
> I have done the simple simulations using some the 741 and 324 models
> included in the gspicegui package, but now I want to check my design
> with something closer to the real part.
>
> I wanted to stick with OSS tools, but I guess I could change to LTSpice.
>
> ...jerry
>
>
> On Thu, May 29, 2008 at 11:05 AM, al davis <ad151@xxxxxxxxxxxxxxxx

> <mailto:ad151@xxxxxxxxxxxxxxxx>> wrote:
>
>     On Thursday 29 May 2008, JERRY DUNMIRE wrote:
>      > Any help or suggestions on how to get the model to work would
>      > be appreciated.
>
>
>     The answer is simple.
>
>     The model says:
>     * Recommendations:
>     *   Use PSPICE (other simulators may require translation)
>
>     So, the answer is that the model is written for PSPICE, and uses
>     features or syntax not supported by gnucap or ngspice.
>
>     One nice (?) thing about spice-format simulators is that they
>     are all different.
>
>     That model probably won't work for HSpice or Eldo either!
>
>
>     Most of the time, you don't need such elaborate models.  This is
>     just an op-amp.  How about using a voltage controlled voltage
>     source, at least for the first attempt?
>
>
>
>
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