The performance of a number of Qucs-S modelling extensions are demonstrated with a GaN HEMT compact device model and data obtained from tests using the Qucs-S/Ngspice/Xyce  ©/SPICE OPUS multi-engine circuit simulator. The digital sources S1 and S2 are the inputs, the node labeled as Output is the output. ![]() ![]() The digital simulation block can be found among the other simulation blocks. Today, Qucs has become a relatively stable simulation package with good high frequency analysis capabilities like small signal AC two port and multi-port S parameter analysis, noise analysis and rudimentary single tone Harmonic Balance (HB) circuit simulation. digital simulations: truth tables, Verilog, VHDL, etc. The multi-simulator version of Qucs is a freely available tool that offers extended modelling and simulation features compared to those provided by legacy circuit simulators. Select the digital components in the combobox of the components tab on the left-hand side and build the circuit shown in figure 1. The course contains theoretical video classes with examples, quizzes, and an entire set of simulation files, step-by-step procedures, recorded data of real-life circuits, and solution videos so that students can learn from and build even better circuits. Particular importance is placed on the interaction between Qucs-S schematics, equation-defined devices, SPICE B behavioural sources and hardware description language (HDL) scripts. The text includes a number of illustrative examples for readers to try and experiment with. This article introduces a number of new features recently implemented in the ‘Quite universal circuit simulator – SPICE variant’ (Qucs-S), including structure and fundamental schematic capture algorithms, at the same time highlighting their use in behavioural semiconductor device modelling. help to Qucs users who are interested in writing and experimenting with their own models. There is an example for analog, but it is so pathetic: a couple of resistors, a voltage source and and output. Current trends in circuit simulation suggest a growing interest in open source software that allows access to more than one simulation engine while simultaneously supporting schematic drawing tools, behavioural Verilog-A and XSPICE component modelling, and output data post-processing.
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