Interactive compact device modelling using Qucs equation‐defined devices

Abstract

Abstract Recent trends in compact device modelling and circuit simulation suggest a growing movement towards standardization of Verilog‐A as a vehicle for semiconductor device specification and model interchange among commercial and open source simulators. This paper introduces a nonlinear equation‐defined device (EDD) characterized by current, voltage and charge equations with a similar syntax to Verilog‐A. The EDD has been implemented in Qucs and used extensively as a central feature in an interactive modelling system that allows straightforward prototyping of compact device models prior to translation into Verilog‐A. To illustrate the properties and the use of the Qucs EDD a number of examples centred on well‐known SPICE models are described. Copyright © 2008 John Wiley & Sons, Ltd.