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Parametric sweep, Monte Carlo simulation and circuit optimization

Additionally to the built-in simulation types, SPICECAD emulates so-called parametric simulations. For example, you want to perform a parameter sweep over the variable 'rload'. It has to be varied between 100Ohm and 500Ohm in 6 steps. First, place a 'paramsweep' -box in the schematic and fill out the entrys. Then, enter the 'parametric*'- menu from the simulation menu or use hotkey 'F9'. Then, execute 'run paramsweep' . The sweep variable name in the parameter sweep box has to be set to 'rload' and not to 'rload'.

Now, six netlists (for each sweep step one netlist) will be written and called one after another in shell-script 'run'. After the last run, SPICECAD receives a SIGNAL and reads in all simulation files except the dc op point information files. (No sweep over dc operation points).

After selecting a single node or terminal, all results (dc, ac or transient) of the different simulation runs can be displayed in the same window.

Circuit optimization , dito.



Martin Maschmann
1999-10-10