Re: gEDA-user: Google Summer of Code on gEDA Webpages

[John Griessen <john@xxxxxxxxxxxxxx>]

Werner Hoch wrote:
> On Sunday 11 March 2007 11:20, Ben Jackson wrote:
> > On Sun, Mar 11, 2007 at 11:02:33AM +0100, Werner Hoch wrote:
> > > I've played with LTSpice an hour.

> > > Things I don't like:
> > >  * only one simulation at a time.
> > Is that true even if you open multiple schematics?
>
> No, no. I need a simulator where I can specify lots of simulations to 
> the same circuit.
>
> If you have a simple transistor amplifier circuit you'd like to know:
>
> * the bias point (maybe with the temperature as parameter)
>
> * small signal ac analyses (with different parameters)
>
> * large signal ac analyses (maybe with fourier analyses)
>
> * step response
>
> * behavior when using the circuit at different loads.
>
> * and many more.
Werner, does your workflow involve just one schematic for all those cases, or some different ones, for the different
parameters, loads, large vs. small signal?

It seems as if the cases could be handled as many schematics, but having one schematic with lots of probes/sources
and a way to change properties and sources based on just the probes and signal sources would be better
for iterating changes to the circuit since the circuit changes would be on just one page.

The Hspice front ends I've used had little change in the graphical part, and parameters were changed in a text
file to get all the corner cases, etc.

A blend of both would be great.  In gnucap (Future edition with plugins for all), that might look like probes
and sources as plugins that can be updated with a GUI, and also have properties coming from a text file, and
both GUI and text file are always in sync.

John Griessen




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