kicad-developers team mailing list archive

[Oscad Team <oscad.team@xxxxxxxxx>]

 @ jp charras,

We wanted netlist with netnumbers to simulate the circuit using Ngspice.
Ngspice is not able to recognize the netlist with netnames.

Thanks
Oscad team


On Fri, Jun 27, 2014 at 5:20 AM, Rick Walker <walker@xxxxxxxxxxxxxx> wrote:

>
> Hi,
>
> I think the proper behavior is to use a net name if it was explicitly
> given in the schematic, otherwise use an automatically generated
> sequential integer with a possible prefix.
>
> > Using net names instead net numbers allows a easy recognition of
> > circuit lines.  Thus, it is easier to write equations for to obtain
> > graphs or executing meas scripts.
>
> Yes.  If I label two signals "final_output_p" and "final_output_m", I
> will expect to be able to graph them by those names.  If I don't label
> them, I probably won't try to graph them in my simulation anyway.
>
> BTW, I have written a SPICE post processor that allows math expressions
> to be performed on the post processor piece-wise-linear output
> variables.  You can add and subtract waveforms by saying things like:
>
>     vnew = v1+v2/3
>     vnew2 = max(v1,v2)
>     vint = integral(vnew + vnew2)
>
> The gr command will plot any expression or waveform.  Multiple
> plots are separated by ";"
>
>     gr integral(delay(v1,10u)+max(v1,v3));  v5
>
> There is a collection of measurement primitives.  For instance you can
> measure the time of the nth zero crossing of a signal with
>
>     t1=xcross(v1,3)
>
> If you wanted to know the value of v2 at that moment you could
> say:
>
>     vm = v2(t1)
>
> It's very handy for evaluating the output of SPICE runs.
>
>     https://www.omnisterra.com/walker/linux/post/
>
> It uses the ascii plotting package:
>
>     https://www.omnisterra.com/walker/linux/pdplot/intro.htm
>
> kind regards,
> --
> Rick Walker
>
>
>
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