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 to 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:
    all popular lumped, RF and digital components,
    microstrip, coplanar and stripline elements,
    SGP, Statz, TOM3, HICUM, JFET, MOSFET models,
    diode, photodiode, tunnel diode, SCR, triac, diac, OpAmp models,
    user-defined components (time, frequency and mixed domain)
    many others ...
  • 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, powerful optimization algorithms, tolerance analysis and manual tuning with sliders
  • creation of user components with:
    equation-defined components (voltage or frequency dependent),
    VerilogA using ADMS by Laurent Lemaitre,
    C/C++ using 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 calculator for:
    single & coupled microstrip line,
    single & coupled coplanar waveguide,
    single & coupled stripline,
    coaxial transmission line,
    rectangular waveguide
    twisted pair
  • filter synthesis (LC ladder, stepped-Z, microstrip, active filters etc.)
  • attenuator synthesis (resistive pi, tee, bridged-tee and splitter topology)
  • component designer for inductances and capacitances
  • GPIB device control
  • import of SPICE and Touchstone files
  • 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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