Extensions to Verilog-A to support compact device modeling

We discuss extensions to Verilog-A that address compact modeling needs. It reviews compact modeling and analog circuit simulation, and then presents a simple Verilog-A compact model for a capacitor. Based on this example, extensions are presented that make Verilog-A better suited to compact modeling. A tentative implementation of each extension is proposed and described. We conclude with a summary of the extensions, implemented in a revised capacitor model.