| Summary: | Circuit simulation is widely used in communication and control equipment hardware design. This article introduces an extended version of the popular Qucs circuit simulator called Qucs-0.0.19S. It is a simulation tool which supports multiple SPICE circuit simulators, including Ngspice and Xyce. The package is equipped with a graphical user interface, component and compact device modelling tools, a choice of simulation engine, and advanced simulation data post-processing facilities. It allows user to construct simulation components using XSPICE "CodeModelling" and to add simulation techniques via Nutmeg scripting. Qucs-0.0.19S is targeted at academic and industrial applications. This paper presents the package software implementation details and a series of typical application studies.
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