Although it comes packed with useful features, the process is not very intuitive and rookies may spend some time trying to configure the dedicated parameters. Qucs is a scientific/engineering software package for analogue and digital circuit simulation, including linear and non-linear DC analysis, small signal S parameter circuit analysis, time domain transient analysis and VHDL/Verilog digital circuit simulation. The opamps are modelled at room temperature and do not track changes with temperature. Comparison of Non-Parabolic Hydrodynamic Simulations for Semiconductor Devices. The generated project can be saved to the following file formats: SCH, DPL, VHD, V, VA, M, or OCT.Äuring our testing we have noticed that the program carries out a task very quickly and without errors throughout the entire process.Īll things considered, Qucs gives you a hand whenever you need to simulate circuits. Differences from the reference (above) occur in the output limiting stage which was modified to reduce internally generated currents associated with output voltage limiting, as well as short-circuit current limiting. Extended behavioural device modelling and circuit simulation with Qucs-S. There are several dedicated tools designed to help you use a text editor, perform filter synthesis analysis, calculate lines, conductor and dielectric losses, create matching circuits, and design sub circuits. Qucs allows users to edit the components of the selected object, perform basic editing operations (cut, copy, paste, delete), rotate, zoom in or out, undo or redo their actions, insert wires, equations, ports, and ground symbol, as well as set markers on a graph. The components can be added and moved with the use of the âdrag and dropâ support. Using the computed H-parameters we can now compare the S-parameter simulation results. Qucs bundles different components to choose from, namely resistors, capacitors, inductors, grounds, sub circuit ports, transformers, amplifiers, attenuators, isolators, circulators, voltage probes, transmission lines, nonlinear components (diodes), Verilog-A devices, digital components (buffers).įurthermore, the application enables users to draw lines, arrows, ellipses, rectangles, embed text messages, and add diagrams (e.g. They represent what can be expected from a typical bipolar transistor. The screenshots will show you its rich feature set. Thanks for all donations to make this come true Download Docs QucsStudio a free and powerful circuit simulator Download Docs Take off and simulate your circuits realistically Screenshots Get a first impression of QucsStudio. I > did try one of the digital comparators, but they seem to only expect logic > level HI/LO voltages, and would not work for me. QucsStudio a free and powerful circuit simulator New version 4.3.1 available. I > had to fake its stages by using the modular op-amp set so LMIN is 0V. Generic Assembly: Provides a base class for implementations of the IComparer generic interface.It boasts a clean interface that gives users the possibility to work with multiple tabs at the same time. The hobby circuit I am building uses an LM339 Quad > Comparator, and compares voltages between the ranges of 100-500 mVAC. I am able to describe the algorithm in code, but don't know how to write it down in QUCS equations.Qucs (Quite Universal Circuit Simulator) is an open-source circuit simulator that offers support for a wide range of simulations, namely DC, AC, S-parameter, Harmonic Balance analysis, and noise analysis. But I don't know how to tell QUCS that the goal is to minimise "max(min(S11, S22, S33, S44))". I can't give a formula like "max(S11)", because that would optimise one component to be good at every frequency. The problem is describing the goal for the optimiser. I am running default Optimization block to try to optimise these four matching components. All of them go to separate sinks with the same file name. This route remains popular amongst most Qucs users because it is easy to understand, is fully interactive and allows straight forward testing of new mod-els. I started with four sources with four different matching components. Qucs releases up to 0.0.10 relied on macromodelling for functional model development via the Qucs schematic interface. Now I'm trying to optimise these components with QUCS. To get around it I decided to use some relays to switch in different capacitors and inductors to get a good match for every frequency with some switching. Because of that matching with a transformer or a lumped component seems impossible. Problem is that for my frequencies (VHF) the complex impedance basically circles the 50Ω point between VSWR 2 and 3 lines. Using Comparator.reversed When invoked on an existing Comparator, the instance method Comparator.reversed returns a new Comparator that reverses the sort order of the original. I am trying to match a dipole antenna to a 50Ω source.
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