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Subject:	Re: [geda-user] gnetlist extractor
From:	John Doty <jpd AT noqsi DOT com>
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Date:	Wed, 13 Feb 2013 16:39:42 -0700
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On Feb 12, 2013, at 10:31 PM, bsalinux AT gmail DOT com wrote:

> Hello,
> 
> Is gnetlist extractor part of gEDA?

Yes. There are two gnetlist back ends for SPICE that are part of gEDA: "spice" and "spice-sdb". There is some pretty good documentation on spice-sdb at http://www.brorson.com/gEDA/SPICE/intro.html.

I have an experimental SPICE back end under development at https://github.com/noqsi/gnet-spice-noqsi.

> Are there any other extractors available?

Not that I know of.

> 
> I tried to do a gnucap simulation involving BS170 MOSFET and the
> extractor did not extract / interpret four contacts for the MOSFET as
> expected by GNUCAP.
> 
> What was extracted was:
> 
> M1  4 1 0 bs170
> 
> instead of (substrate connected to source)
> 
> M1  4 1 0 0 bs170

The "spice" and "spice-sdb" back ends assume that the SPICE device has the same number of connections as the symbol, so if you use a three terminal symbol, you'll get the result you're seeing. One way to get around this is to have the model-name attribute refer to a three terminal subcircuit in which the four terminal primitive device is embedded. Be sure to use a refdes starting with "X" in this case. Or you can use a four terminal symbol. 

My spice-noqsi back end is more flexible, with a spice-prototype attribute that you can attach to a symbol to give the netlister more detailed instructions. For the nmos-3 symbol, you could use use "spice-prototype=M? #D #G #S #S bs170".

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com

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