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Subject:	Re: [geda-user] Stop playing stupid political games with gEDA
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From:	John Doty <jpd AT noqsi DOT com>
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Date:	Fri, 9 Oct 2015 13:28:40 -0600
Message-Id:	<6527A49D-BD9D-4CD5-8DF8-C7612BE75BE1@noqsi.com>
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On Oct 9, 2015, at 12:20 PM, Kai-Martin Knaak =
<knaak AT iqo DOT uni-hannover DOT de> wrote:

> Geda currently provides good support to schematic capture and layout. =
But
> it lacks a readily available intuitive interface to simulation. By
> contrast, the one thing qucs can do well, is simulation. Schematic =
capture
> is a bit cumbersome. PCB layout is a long term goal far beyond the =
current
> horizon.
>=20
> Doesn't this sound like an opportunity to cooperate on application =
level?
> I imagine a work-flow similar to gschem->pcb:
>=20
> 1) gschem: capture schematic. Have symbols contain a model attribute.

Or not (you don=92t usually need a resistor model). Or more, for example =
describing in detail how symbol pins connect to model ports.

> 2) qucs: import schematics from geda

It=92s gnetlist=92s responsibility to export. So, you need a gnetlist =
back end.

> 3) qucs: add drivers and probes

For ngspice, I typically make a gschem schematic with drivers and =
probes. In extreme cases, I=92ll write a little program in whatever =
language I feel like on the day in question to generate PWL sources for =
stimulus.

> 4) qucs: simulate
> 5) mull over wave forms
> 6) gschem: change values, add that crucial capacitor
> 7) qucs: update schematics from geda
> 8) goto 4)

So, the question becomes, what=92s the qucs netlist format? Roland and I =
could have a race ;-)

The advantage of using gschem, of course, is that you can then take the =
schematic and re-export it for layout. This didn=92t work very well with =
the original spice back end. With spice-sdb, it was better, but there =
were still problems. With https://github.com/noqsi/gnet-spice-noqsi it=92s=
 practical and reliable, I do it routinely.

Note that gnet-spice-noqsi is one of those notorious =93inactive=94 =
projects. It just works. Oh, there are a few things I=92ve thought of =
that might be nice, but their lack doesn=92t cause me enough trouble to =
motivate me to change it.

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



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