a free and powerful circuit simulator


QucsStudio is mainly a circuit simulator that has evolved out of the project Qucs, but isn't compatible with it. The simulation engine is even a complete new creation. It's meant be be a test project to create a complete development environment for electrical engineers. (graphical user interface, circuit simulator, PCB layouting, numerical data processing etc.) The application uses Qt4® by the Qt Company® as graphical user interface.

By the way: The correct pronunciation of Qucs is [kju:ks].

Legal Stuff

QucsStudio is free software that is allowed to be used and distributed freely. The copyright information must not be removed. There is no warranty at all, not even for merchantability or fitness for a particular purpose.


Currently the following applications are supported:

  • more than 100 circuit components (including microstrip elements, Statz, TOM3 and HICUM model)
  • DC analysis
  • AC analysis (including noise analysis)
  • s-parameter analysis (including noise parameter calculation)
  • transient analysis (including periodic steady-state simulation)
  • Harmonic Balance analysis (including large-signal AC and noise analysis)
  • system simulations
  • parameter sweeps, optimization and Monte Carlo analysis of analogue circuits
  • component modeling in C++ and in VerilogA using ADMS by Laurent Lemaitre and MinGW compiler
  • digital simulations in Verilog using ICARUS by Stephen Williams
  • digital simulations in VHDL using GHDL by Tristan Gingold
  • PCB layout and Gerber viewer using KiCAD by the KiCAD team
  • numerical data processing using Octave by John W. Eaton et al.
  • RF transmission line calculation (coaxial, microstrip, coupled microstrip, coplanar line, stripline, twisted pair, rectangular waveguide etc.)
  • filter synthesis (LC ladder, stepped-impedance, microstrip, active filters etc.)
  • attenuator synthesis (resistive pi, tee, bridged-tee and splitter topology)
  • inductance designer
  • GPIB device control
  • technical documentation of all models and types of simulation
  • support of German and English language
  • displaying HTML files (e.g. for documentation)


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