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gnucap - GNU Circuit Analysis Package


gnucap [-b filename] [-i filename]


GNUCAP is a general purpose circuit simulator. It performs nonlinear dc and transient
analyses, fourier analysis, and ac analysis linearized at an operating point. It is fully
interactive and command driven. It can also be run in batch mode or as a server. The
output is produced as it simulates. Spice compatible models for the MOSFET (level 1,2,3)
and diode are included in this release.

Since it is fully interactive, it is possible to make changes and re-simulate quickly.
The interactive design makes it well suited to the typical iterative design process used
it optimizing a circuit design. It is also well suited to undergraduate teaching where
Spice in batch mode can be quite intimidating. This version, while still officially in
beta test, should be stable enough for basic undergraduate teaching and courses in MOS
design, but not for bipolar design.

In batch mode it is mostly Spice compatible, so it is often possible to use the same file
for both GNUCAP and Spice.

The analog simulation is based on traditional nodal analysis with iteration by Newton's
method and LU decomposition. An event queue and incremental matrix update speed up the
solution for large circuits (at some expense for small circuits).

It also has digital devices for mixed signal simulation. The digital devices may be
implemented as either analog subcircuits or as true digital models. The simulator will
automatically determine which to use. Networks of digital devices are simulated as
digital, with no conversions to analog between gates. This results in digital circuits
being simulated faster than on a typical analog simulator, even with behavioral models.
The digital mode is experimental and needs work. There will be substantial improvements
in future releases.


Two command-line options are available. Only one of these may be specified. If no
parameters are given, gnucap will start in interactive mode.

-b filename
execute the commands in the named file then exit (batch mode)

-i filename
execute the commands in the named file then go into interactive mode

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