On Fri 04/10/09 2:25 PM , John Doty [email protected] sent: > > On Apr 10, 2009, at 11:04 AM, awchang2 > @buffalo.edu wrote: > > Hi, > > > > I have this assignment for a circuit analysis > class. We're supposed > to use pspice, but I'm having a couple of > problems using the software.> > > We're supposed to find the magnitude and phase > of I, I_C, and I_L. > So I loaded up my netlist into ngspice, and I > performed a transient > analysis with a step size of 5 ns and a duration > of 200 ns:> > > ngspice -> tran 5ns 200ns > > While it is possible to use transient analysis for this purpose, AC > analysis is easier for a linear circuit like this.
Yeah, that's what I thought, but my TA wants us to use a transient analysis, for some reason. As for doing it by hand, and how it's overkill to use ngspice, I know. But that's what the assignment asks for. I guess it's to practice using ngspice... It also wants it done by hand. For that portion, I'm using KVL, Ohm's Law, and complex impedance. > > > > It gave me the voltage, which is good and all, > but how do I get the > magnitude and phase of the current without doing > it by hand > There's a trick: in SPICE, a voltage source of zero volts functions > as a current meter. Okay, so I can't seem to get it to work. Here's my netlist: * Spice netlister for gnetlist V1 4 1 DC 0 Vs 1 0 sin(0 56.56 477.5) V3 6 3 DC 0 R2 5 6 1k V2 5 2 DC 0 R1 4 5 1.5k L 0 2 0.333 C 0 3 0.167uF .END when I try to do something like: print mag(I(V1)) ph(I(V1)) it returns: Error: no such function as I. Thanks so much, so far Stuart Brorson and John Doty. > > (i.e. only using ngspice)? Attached is a picture > of the schematic > (if that's necessary). > > > > Best regards, > > Albert Chang > > > > > _______________________________________________> geda-user mailing list > > geda > [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
