![]() ![]() Including for example, DC, AC, and transient simulation, Fourier-analysis and sensitivity analysis, It implements the original SPICE3f5 simulation capabilities, Of the most widely used and stable current generation open source SPICE simulators available. Three open source software packages: SPICE 3f5, Cider 1b1 and XSPICE. Ngspice is a mixed-level/mixed-signal circuit simulator implemented from The Ngspice, Xyce and SPICE OPUS simulators are not embedded in Qucs but operate as independent external simulators.īefore use they must be installed on the computer operating system that you are running Qucs. Subsystem specifically designed for this purpose. Spice4qucs includes built-in support for SPICE via a The Ngspice, Xyce and SPICE OPUS compatible simulator engines. This section describes a number of fundamental methods for launching circuit simulations from the Qucs GUI using 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.Basic Ngspice, Xyce and SPICE OPUS simulation Introduction 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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