Qucs is a circuit simulator with graphical user interface. The software aims to support all kinds of circuit simulation types, e.g. DC, AC, S-parameter, Transient, Noise and Harmonic Balance analysis. Pure digital simulations are also supported.
- schematic capture
- analog and digital simulations
- data visualization
Still too complicated too use or at least not intuitive GUI at all! Have been able to open examples - BUT still I can't simulate the circuit (without reading the help or documentations) :/ I like the project and effort though and that's why I'm giving high rating.
This is a good program, but when I use the RLCG transmission line to generate a .s4p file, I meet a problem: In the frequency domain, there won’t be anything in the 1,3/1,4 or 2,3/2,4 combinations.