Digital vs analog simulation and in between, principles of fast spice algorithms, how Gnucap does it. Possible simulator architectures, monolithic vs modular. Relevant implementation details and benefits will be highlighted.

Recent applications will be presented, including Gnucsator, Gnucap-Python. Gnucsator provides the component library needed to replace the simulator behind the QUCS project. Gnucap-Python builds the bridge between component modelling, circuit simulation and scientific software packages available from Python scripts. Examples include parametric optimisation (nlopt) and transfer function analysis (scipy).