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Subject: Re: [geda-user] A lesson from gnet-makefile
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On Mon, Oct 12, 2015 at 04:19:36PM -0600, John Doty wrote:
> 
> On Oct 12, 2015, at 4:00 PM, Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> 
> > Should the consumers be the ones with negative values?
> > This does not sound very intuitive at first and they are the majority,
> > but they are the current sinks. On the other hand, a power net typicaly
> > has only one source (I'm aware of current sharing schemes, they do exist
> > but they are not the common case).
> 
> The SPICE convention familiar to many is that current sources have negative current, current sinks, positive.

Ok, fine. I don't do much simulation. I've been doing a little, but
mostly to check sensitivity to uncertainties after synthesis of 
networks.


OTOH, it occurred to me that we could distinguish by using "currentin" and 
"currentout" attributes to differentiate sinks (consumers) from sources
(producers), independently of the sign of the power rail voltage.

BTW, for thermal reasons, you typically want to specify the RMS of the
current, not the linear average. That's quite different, say, at the input 
of a buck SMP regulator, at least between the decoupling capacitors and the
current switches.

    Gabriel