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Optimization<br />

Fourband Filter Optimization<br />

This example illustrates the fitting of a filter response. It illustrates the influence of the initial<br />

point in circuit optimization and the relative robustness of the optimizer.<br />

Figure 13-21. Filter Response<br />

A set of eighteen circuit parameters is to be optimized such that the voltage at node 12 follows<br />

the curve response given in Figure 13-21. This plot also shows the initial response.<br />

Analyses<br />

A single AC analysis is performed, driven by .DATA command.<br />

.AC DATA=DATA_FOURBAND<br />

.DATA DATA_FOURBAND<br />

+ FREQ VDB12<br />

+ 1.122E+02 -8.326E+00<br />

+ 1.166E+02 -7.435E+00<br />

+ 1.212E+02 -6.566E+00<br />

*...<br />

+ 8.913E+04 -4.212E-01<br />

+ 9.261E+04 -4.213E-01<br />

+ 9.624E+04 -4.215E-01<br />

.ENDDATA<br />

Design Variables<br />

The design variables are resistor and capacitor values of the circuit. The initial (or nominal)<br />

values are given below.<br />

The capacitors CT, CLC and CPASS have been specified separately to illustrate the effect of the<br />

initial conditions on the optimizer (refer to “Global and Local Optimization” on page 629 for<br />

more information).<br />

672<br />

Eldo® User's Manual, 15.3

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