Tool Suite
Qucs consists of several standalone programs interacting with each other through the GUCS.
The GUI is used to create schematics, setup simulations, display simulation results, writing VHDL code, etc.
The analog simulator is a command line program which is run by the GUI in order to simulate the schematic which you previously setup. It takes a netlist, checks it for errors, performs the required simulation actions, and finally produces a dataset.
The text editor is used to display netlists and simulation logging information, and to edit files included by certain components (e.g. SPICE netlists, or Touchstone files).
The filter synthesis application can be used to design various types of filters.
The transmission line calculator can be used to design and analyze different types of transmission lines (e.g. microstrips, coaxial cables).
The component library manager holds models for real life devices (e.g. transistors, diodes, bridges, opamps). It can be extended by the user.
The attenuator synthesis application can be used to design various types of passive attenuators.
The command line conversion program tool is used by the GUI to import and export datasets, netlists and schematics from and to other CAD/EDA software. The supported file formats as well as usage information can be found on the manpage of qucsconv.
Additionally, the GUI steers other EDA tools. For digital simulations (via VHDL) the program FreeHDL is used. For circuit optimization (minimization of a cost function), ASCO is configured and run.
Read more about this topic: Quite Universal Circuit Simulator
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