Gnucap is a Free versatile and modern, modular, analog and mixed-signal simulator. Verilog-AMS is a standardised behavioural language for analog and mixed-signal systems based on the IEEE 1364-2005 industry standard, commonly known as Verilog.

Gnucap was invented to advance circuit simulator technology from around 1985, at the time SPICE was developped (1973-1993) at UC Berkeley. Gnucap was released under GPLv3+ in 2001 to avoid patent issues. Today, proprietary simulators supposedly implement the most efficient algorithms yet inspired by public research from the past century. Meanwhile, the Gnucap project is making progress harvesting the breaktroughs, for use in free/libre software.

To address the interoparability across circuit design tools, and across modelling domains, Verilog-AMS was created. Verilog-AMS extends traditional Verilog by analog features known from SPICE, and permits models that interact with both the digital and analog domains. The standard expertly allows for vendor-independent representations of modern circuit designs.

1 In this talk, we will explain the new revision of our proposed IEEE 1364-2005 compliant schematic interchange format, and how seamless interaction will empower FOSS EDA tools. We will outline work in progress, possibly demonstrate an application, and hint at opportunities. We will explain how the interchange will extend towards PCB design and layout

2 We will summarise new mixed signal features available in modelgen-verilog. This includes monitored analog events, as well as discrete modelling in terms of user defined primitives. We will expand on the usefulness of discrete disciplines and "connect modules", and give an update on the implementation status.

3 On the algorithmic end, we have added a plugin interface for VLSI-ready matrix solvers to the zoo. We will highlight a new solver combining temporal sparsity with the time/space efficiency of "conventional sparse" LU decomposition. We will explain why Gnucap will outpace traditional (open source) solvers on virtually all instances, both small and big circuits.