1 .\" Hey, Emacs! This is an -*- nroff -*- source file.
2 .TH GNUCAP 1 "November 2001" "Debian Project" "Debian GNU"
5 gnucap \- GNU Circuit Analysis Package
8 [\fB-b\fP filename] [\fB-i\fP filename]
12 is a general purpose circuit simulator. It performs nonlinear
13 dc and transient analyses, fourier analysis, and ac analysis
14 linearized at an operating point. It is fully interactive and
15 command driven. It can also be run in batch mode or as a server.
16 The output is produced as it simulates. Spice compatible models
17 for the MOSFET (level 1,2,3) and diode are included in this
20 Since it is fully interactive, it is possible to make changes and
21 re-simulate quickly. The interactive design makes it well suited
22 to the typical iterative design process used it optimizing a circuit
23 design. It is also well suited to undergraduate teaching where
24 Spice in batch mode can be quite intimidating. This version, while
25 still officially in beta test, should be stable enough for basic
26 undergraduate teaching and courses in MOS design, but not for
29 In batch mode it is mostly Spice compatible, so it is often possible
30 to use the same file for both GNUCAP and Spice.
32 The analog simulation is based on traditional nodal analysis with
33 iteration by Newton's method and LU decomposition. An event queue
34 and incremental matrix update speed up the solution for large
35 circuits (at some expense for small circuits).
37 It also has digital devices for mixed signal simulation. The
38 digital devices may be implemented as either analog subcircuits or
39 as true digital models. The simulator will automatically determine
40 which to use. Networks of digital devices are simulated as digital,
41 with no conversions to analog between gates. This results in
42 digital circuits being simulated faster than on a typical analog
43 simulator, even with behavioral models. The digital mode is
44 experimental and needs work. There will be substantial improvements
48 Two command-line options are available. Only one of these may be
49 specified. If no parameters are given, gnucap will start in interactive
53 execute the commands in the named file then exit (batch mode)
56 execute the commands in the named file then go into interactive mode
59 .B /usr/share/doc/gnucap/bugs
60 for a list of known bugs in this release.
62 GNUCAP is an ongoing research project. It is being released in a
63 preliminary phase in hopes that it will be useful and that others
64 will use it as a thrust or base for their research. I also hope
65 for some comments that may help me direct my research.
68 GNUCAP is being written by Albert Davis <aldavis@ieee.org>
70 This manual page was written by Jon Rabone <jkr@debian.org> and maintained
71 by Hamish Moffatt <hamish@debian.org> for the Debian package of gnucap.
72 For the full LaTeX documentation, please see
73 .B /usr/share/doc/gnucap/manual.