gEDA-user: Expert help needed - gschem/ngspice etc...

[John Doty]

On Jul 31, 2006, at 10:09 PM, John Coppens wrote:

> On Mon, 31 Jul 2006 21:00:39 -0600
> John Doty <jpd at wispertel.net> wrote:
>
>> Slotting is a fabrication concept. SPICE doesn't understand slotting.
>> Don't use it in your sims.
>
> Hi John...
>
> Thanks for the reply. I thought the idea of gEDA was to make a  
> complete
> package, including fabrication and simulation. Actually, it's not  
> SPICE
> that's complaining either - it's the netlister which isn't happy.

Since SPICE doesn't deal with slots, the netlister doesn't know how  
to tell it what to do.

gEDA *is* a complete package: it can compose schematics for  
simulation or for fabrication. But simulation is device and  
subcircuit oriented, while fabrication is part oriented. They aren't  
the same thing, and I think trying to do this mapping would make  
symbol creation incomprehensible to many. Note that if you download a  
SPICE model for a quad opamp from a manufacturer you'll actually get  
a model of just one section. It's a common problem, not specific to  
gEDA.

You can spend $100k/yr on EDA and still struggle with this issue  
(been there, done that).

John Doty              Noqsi Aerospace, Ltd.
jpd at wispertel.net