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 What does work is to redraw the entire subcircuit using native components, but that's even more tedious.For circuit optimization, Qucs uses the ASCO toolīrief description on how to prepare your schematic, execute and interprete the If I figure out how to make it work, I'll update it. sch file you just created.Īnd when you've done all this. Give it a reference designator and select the.From Components → file components, create Subcircuit.After saving the subcircuit, go back to the main circuit.I don't know of any way to use existing component symbols. Draw the symbol you want, with the connections in the place you want them.Now you can create the subcircuit symbol.It also creates a Ref port, which I don't think does anything? Connect it to ground?.You can double-click the ports to give them meaningful names and pin numbers that match the physical part, too. ![]()
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