a free and powerful circuit simulator

Examples

The following files contain circuits that demonstrate the functionality of simulator and GUI. They are archive files that are decompressed by QucsStudio. (Drag'n'Drop into project list or via menu: Project → Extract Package...)

DC analysisDC bias, nested sweeps
AC analysisnoise contribution etc.
transient analysisoscillators, peak detectors, periodic steady-state analysis etc.
s-parameter analysisgain/stability/noise circles, Touchstone files
HB analysisHarmonic Balance, large-signal AC, large-signal s-parameter analysis
digital simulationstruth tables, Verilog, VHDL, etc.
system simulationoptical telecommunication systems, eye diagrams, bit error rate (BER)
circuit optimizationfinding best-fit of component parameters
Monte-Carlo analysisestimation of tolerances
PCB layoutdesigning a printed circuit board of an electrical circuit
Octavescripts, post-processing, mex files, script-based schematic creation
C++/VerilogA modelscreating user models
binary component librarycontains the following models: Curtice, Statz, TOM1...3, EKV, HICUM L0/L2, stripline and more (many thanks to Mike Brinson for contributing most of the models)
Circuit collectiona small collection of circuits (oscillators, peak detectors, mixers)
SPICE importshort description on how to import SPICE files
programmingsmall examples for programming console applications in C/C++