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Welcome to the Gnucap home page!

Gnucap is the Gnu Circuit Analysis Package.

The primary component is a general purpose circuit simulator. It performs nonlinear dc and transient analyses, fourier analysis, and ac analysis. Spice compatible models for the MOSFET (level 1-7), BJT, and diode are included in this release.

Gnucap is not based on Spice, but some of the models have been derived from the Berkeley models.

Unlike Spice, the engine is designed to do true mixed-mode simulation. Most of the code is in place for future support of event driven analog simulation, and true multi-rate simulation.

If you are tired of Spice and want a second opinion, you want to play with the circuit and want a simulator that is interactive, you want to study the source code and want something easier to follow than Spice, or you are a researcher working on modeling and want automated model generation tools to make your job easier, try Gnucap.

New features in 0.34

  • This is primarily a bug fix and compatibility release.
  • Fix bug causing incorrect interpolation of backwards tables.
  • Fix tanh overflow bug.
  • Fix some parsing bugs.
  • Fix occasional "double load" bug.
  • Fix AC sweep with one point.
  • Transient start time really works.
  • Fix occasional assert fail after option short is changed.
  • Fix memory leak resulting from failure to delete unused common.
  • Fix a Z probe bug that sometimes gave wrong answers.
  • Fix a limiting bug that sometimes caused non-convergence.

    • News/Announcements

    August 8, 2005
    Version 2005-08-08 released.
    June 10, 2005
    Version 2005-06-10 released.
    February 20, 2005
    Version 2005-02-20 released.
    January 27, 2005
    Version 2005-01-27 released.
    January 26, 2004
    Version 0.34 released.

    Please send FSF & GNU inquiries & questions to gnu@gnu.org. There are also other ways to contact the FSF.

    Please send comments on these web pages and Gnucap to bug-gnucap@gnu.org

    Copyright (C) 2002,2003,2004 Albert Davis aldavis@gnu.org

    Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.

    Last modified: Thu Jan 22 16:50:37 EST 2004