XSPICE code models have been intrgrated into ngspice since starting the ngspice project. Currently 68 device models are available, ranging from simple elements like analog gain cells or digital inverters up to complex ones like a digital state machine , SRAMs, 3D table models or interfaces to digital Verilog building blocks compiled with Verilator. The simulation with digital blocks is fast, since event based. The interface between digital and analog blocks is automated.

The use of the XSPICE code models has been hampered a bit due to their specific interfaces and the lack of graphical symbols of its elements for creating user readable circuit diagrams.

So I have started a project to provide XSPICE code model support via the well-known KiCad/ngspice integration. It comprises of a symbol library and its assiciated device models assembled in a subcircuit model library. In the talk I will inform about its concept and status and will present some application examples.

https://forum.kicad.info/t/simulation-with-xspice-code-models/56384 https://sourceforge.net/projects/ngspice/