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Date: | Mon, 29 Oct 2012 23:12:12 +0400 |
From: | Vladimir Zhbanov <vzhbanov AT gmail DOT com> |
To: | geda-help AT delorie DOT com |
Subject: | Re: [geda-help] Another new user question on ngspice- how to export |
plots, and using current | |
Message-ID: | <20121029191212.GB28209@localhost.localdomain> |
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References: | <a122194d067751cf4d45af085e91cf10 DOT squirrel AT webmail DOT strucktower DOT com> |
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On Sat, Oct 27, 2012 at 07:51:55PM -0700, keitho AT strucktower DOT com wrote: > Hi all- > > I'm using ngspice on Linux/Debian. I guess the graphing/plots are done > using X11 by default? I haven't figured out how to export my graphs to > PNG's so that I can send them in emails to folks helping me learn. Is > there a way to do that, or do you recommend using a different program for > graphing the plots that provides that feature? I'd suggest you to try out gnuplot or pyxplot. > > Second question: in general, I'm confused about the way ngspice handles > current. Just as an example, here's a trivial netlist of a circuit using a > current source to drive the base: > > common-emitter amplifier > i1 0 1 dc > q1 2 1 0 mod1 > r 3 2 5000 > v1 3 0 dc 15 > .model mod1 npn > .control > dc i1 0 50u 2u > run > plot v(2) > .endc > .end > > Here's the output of display: > > ngspice 2 -> display > Here are the vectors currently active: > > Title: common-emitter amplifier > Name: dc1 (DC transfer characteristic) > Date: Sat Oct 27 22:39:55 2012 > > V(1) : voltage, real, 26 long > V(2) : voltage, real, 26 long > V(3) : voltage, real, 26 long > i-sweep : voltage, real, 26 long [default scale] > v1#branch : current, real, 26 long > > > The graph of this is the correct shape, but I'm confused about why it is > sweeping voltage rather than current. Can someone explain what's going on > here, or point to a tutorial that would help? Looks like a bug in ngspice. You'd better ask this in one of ngspice mailing lists (you can find their addresses at http://ngspice.sourceforge.net/faq.html). Or try to use gnucap and compare results. There are some differences between the two programs in the netlist format they're using. Be prepared. -- http://vzhbanov.byethost33.com
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