MicroCAP (proprietary) or Ngspice (open-source)). Also, the modeler is slower than similar Spice-compatible modelers (e.g. But this drawback is not an obstacle to use, since Qucs is compatible with the Spice format in which models of electronic components in datasheets are presented. The disadvantage of Qucs is the small number of library components. These features are absent in the proprietary MicroCAP and MultiSim systems, and here Qucs even surpasses commercial software and allows to obtain results unattainable for simulators of electronic circuits based on Spice. So, a distinctive feature of Qucs is the ability to analyze complex frequency characteristics (CFC), graphing on the complex plane and Smith diagrams, analysis of complex resistances and S-parameters. The screenshots show an example of modeling the S-parameters of a high-frequency broadband amplifier. Qucs can convert S parameters to Y and Z parameters. A distinctive feature of this engine is the built-in ability to simulate S-parameters and SWR, which is important for the analysis of RF circuits. Qucs is based on the newly developed circuit modeling engine. Simulation results can be exported to Octave / Matlab and post-processed.
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