On Apr 10, 2009, at 1:07 PM, Yamazaki R2 wrote: > Sorry to randomly jump in here, but in ngspice, the only way to probe > current is to probe a 0V voltage source? Theres no other work arounds > for this?
It's classic SPICE technique. > For example, if I had a very large hierachical design with > 10,000 transistors in it and I wanted to plot the drain current of one > particular transistor, I'd have to either edit the schematics and > break apart the net and insert a 0V voltage source or hack the > netlist? Hardly difficult. The most important thing any professional needs to learn is not to get stuck on a trivial impediment. > Isnt that a pretty important missing feautre? Gnucap lets you > probe device currents without hacking the schematics. Gnucap is a rapidly advancing work in progress. SPICE is conservative, stagnant, but still much more important. There's enormous knowledge and experience available for SPICE, little for gnucap. I expect gnucap will eventually surpass SPICE in all areas, but it isn't there yet. > > On Fri, Apr 10, 2009 at 11:33 AM, John Doty <[email protected]> wrote: >> >> On Apr 10, 2009, at 12:19 PM, [email protected] wrote: >> >>> So spice won't actually calculate the current for me? >> >> In this particular case, you can also use Ohm's law to convert >> voltage to current through the resistors, and KCL to get the reactive >> currents versus time from your transient simulation. Of course, you >> could also just do it entirely by hand from the complex impedances at >> a given frequency. Spice is a little excessive here. >> >> Lots of ways to do this problem. You want to get good at this? Master >> them all.. >> >> John Doty Noqsi Aerospace, Ltd. >> http://www.noqsi.com/ >> [email protected] >> >> >> >> >> _______________________________________________ >> geda-user mailing list >> [email protected] >> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user >> > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ [email protected] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
