Most circuit simulators have a number of common basic attributes firstly circuits are represented by a textual netlist or a schematic diagram which contains all the information required by a simulator to analyse the performance of a circuit, and secondly a simulation engine which undertakes the calculation of circuit performance in one or more different circuit domains such as DC, AC or transient, and thirdly a post simulation processing system which structures and displays the simulation data in both tabular and graphical forms. Qucs electronic device and circuit modelling Circuit simulation packages are complex software systems which often take years to mature to a stage where they are capable of analysing the current generation of integrated and discrete electronic circuits. The text includes a number of illustrative examples for readers to try and experiment with. The aim of this tutorial note is to outline the background to these important package extensions and to provide real help to Qucs users who are interested in writing and experimenting with their own models. Much of these new aspects have up to now been undocumented and are likely to be very new to most Qucs users. In designing the latest Qucs modelling features the Qucs team has made a central focus of their work the need to provide the package with an interactive and easy to use modelling system which allows fast model prototype construction. Release.12 extends these features to add model development using symbolic equations that are similar to compact device code written in the Verilog- A modelling language. ![]() Release.11 introduced component values defined by equations and for the first time allowed subcircuits with parameters. A copy of the license is included in the section entitled GNU Free Documentation License.ΔΆ Introduction Qucs releases.11 and.12 mark a turning point in the development of the Qucs component and circuit modelling facilities. 1 Qucs A Tutorial Component, compact device and circuit modelling using symbolic equations Mike Brinson Copyright c 27 Mike Brinson Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation.
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