4/10/2024 0 Comments Qucs equation tutorialThe documentation offers many useful tutorials (WorkBook), reports (ReportBook) and a technical description of the simulator. Simulation data can be represented in various types of diagrams, including Smith-Chart, Cartesian, Tabular, Polar, Smith-Polar combination, 3D-Cartesian, Locus Curve, Timing Diagram and Truth Table. Qucs has a graphical interface for schematic capture. It is intended to be much simpler to use and handle than other circuit simulators like gEDA or PSPICE.Īnalysis types include S-parameter (including noise), AC (including noise), DC, Transient Analysis, Harmonic Balance (not yet finished), Digital simulation (VHDL and Verilog-HDL) and Parameter sweeps. Qucs supports a growing list of analog and digital components as well as SPICE sub-circuits. Qucs uses its own SPICE-incompatible backend simulator Qucsator, however the Qucs-S fork supports some SPICE backends. Only a small set of digital devices like flip flops and logic gates can be used with analog circuits. Pure digital simulations are also supported using VHDL and/or Verilog. It offers the ability to set up a circuit with a graphical user interface and simulate the large-signal, small-signal and noise behaviour of the circuit. You can change the number of figures shown for the optimized values in the optimization dialog by right-clicking on the "initial" table header and selecting the "Set precision" menu, as shown in the following figure.įigure 10 - Changing the displayed variables precision.Quite Universal Circuit Simulator (Qucs) is a free-software electronics circuit simulator software application released under GPL. In case you need to do further modifications to the schematic, the optimization component can now be disabled and the optimized values from the pasted equation will be used. The resulting schematic will be as shown in the next figure.įigure 9 - Schematic with optimized values. They are now the initial values for each one of introducedīy clicking the "Copy current values to equation" button, an equation component defining all the optimization variables with the values of the "initial" column will be copied to the clipboard and can be pasted to the schematic after closing the optimization dialog. The best found circuit sizes can be found in the optimization dialog, in the Seconds on a modern computer, the best simulation results is shown in the The last step is to run the optimization, i.e. The resulting schematic is show in Figure 6. The next step is to change the schematic, and define which circuit elements are Them into a single cost function, that is then minimized.įigure 5 - Optimization dialog, goals options. Identifiers placed into properties of components and not the components'įigure 4 - Optimization dialog, variables options.įinally, go to Goals where the optimization objective (maximize, minimize) andĬonstraints (less, greater, equal) are defined. In the Variables tab, defining which circuit elements will be chosen from theĪllowed range, as shown in Figure 4. Over- or underestimationĬan lead to a premature convergence of the optimizer to a local minimum or, a very longįigure 3 - Optimization dialog, algorithm options. Iterations', 'Constant F' and 'Crossing over factor'. From theĮxisting parameters, special attention should be paid to 'Maximum number of Now, open the optimization component and select the optimization tab. The schematic from Figure 1 and change it until you have the resulting schematic To setup a netlist for optimization two things must be added to the alreadyĮxisting netlist: insert equation(s) and the optimization component block. Optimization problem as a composition of functions, leading in this case to the It can either be the delay or the rise time of a digital circuit, or Optimization of a circuit is nothing more than the minimization of a costįunction. Before using this functionality, ASCO must be installed For circuit optimization, Qucs uses the ASCO toolīrief description on how to prepare your schematic, execute and interprete the
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