About SimCAS

• Documentation
• Examples
• Roadmap

Links

• SimCAS on Sourceforge
• ADMS
  Verilog-A to C code generator for the API of spice simulators
• NG-SPICE
  Mixed-mode mixed-level circuit simulator
• The Quite Universal Circuit Simulator (QUCS)
  A very powerful open source circuit simulator
• Eispice
  Charles Eidsness's Spice clone
• Open Collector
  Free CAD software repository
• wxWidgets
  The toolkit used to develop SimCAS
  
• 

News

(2009-11-01) SimCAS V0.5 released.

New features in this release :

• Enhanced solving and computation algorithms.
• if...else instructions added.
• DC sweep analysis added.
• Many bugs corrected.

(2008-03-09) SimCAS V0.4 released.

New features in this release :

• New component models : NE555, Triggers, transistors.
• New examples.
• Simplified syntax for component declaration.

SimCAS Overview

SimCAS is a free, open source, simple and very flexible analog simulator.
The goal of this project is not to build a simulator as powerful as Spice or Qucs but to try solving electric networks by using a CAS approach. CAS means "Computer Algebra System". SimCAS uses symbolic equations to define components and solves the systems without using matrix. It uses the Taylor Expansion Diagrams theory.

The advantages compared to matrix approach are :

• low memory consumption ( no use of big matrix with plenty of ‘0’ ). Equations are stored as stacks with elements and operators.
• once compiled in a simple form, the equations are easy to compute. You can modify a parameter value without doing complex computation as matrix solving. Just get the value from the resulting equations.

Possibility is given to users to define their own components by using symbolic equations.

SimCAS can handle nonlinear DC, nonlinear transient, and linear AC analysis.

SimCAS is built with wxWidget 2.8.10 ( www.wxwidgets.org ) and uses the framework library wxAUI.

It is delivered in two parts :

• GUI source code based on the wxWidget set of classes,
• The mathematical kernel source code which is toolset independant. It uses standard and built-in C++ classes.

SimCAS runs on Windows2000 / XP and Linux( Ubuntu ). It can be compiled through Visual C++ ( Native Windows ) or through a makefile ( Cygwin / Linux ).