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

[Dan McMahill <dan-atMUNGEDmcmahill_dot_net>]

Bert Timmerman wrote:
> Hi Werner,
> 
> Having read the wiki on Spice improvements I want to share some thoughts
> that came to mind.
> 
> I'm not a user of Spice or any other simulation program, so take my comments
> with the right amount of salt required for good taste ;-)

You can flavor mine as coming from the viewpoint that I've typically not 
found board level simulations to be that important except in a few 
cases.  In those, the sims were small enough that just  saving all 
signals would not have been a problem at all.  I've used simulators 
extensively in ic design flows though, but perhaps thats not the crowd 
of interest here.

> About probes: 
> 
> Good idea to implement the current/voltage probes as symbols.

I've done a number of designs where it was important to run the 
simulation and then access a fairly large number of voltages.  Also on 
simulations which take a long time to run I often times want to save all 
node voltages.  It's no fun to spend hour or days waiting on a 
simulation only to find you didn't save some signal of importance.  At a 
minimum, an option to save all signals of certain classes would be good 
(classes would be things like all node voltages that are not internal to 
models, all node voltages internal to models, all currents not internal 
to models, all currents internal to models, etc)


> One could leave them in the schematic as to preserve the position and values
> of testpoints on the pcb.
> 
> After running a simulation, one should be able to select a "down probe" menu
> item for one or more selected probe symbols (in a "simulation" pull down
> menu inside gschem) as to obtain a value popup dialog window for static
> analysis results or a waveform popup dialog window for dynamic analysis
> results.

I'm way more interested in selecting "plot node voltage" and then 
clicking the nodes in the schematic that I want to get waveforms for. 
Why?  It scales much better to large simulations.

-Dan


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