Environmental Engineering Reference
In-Depth Information
presented in Chapter 3 gives an accurate prediction to the fundamental
frequency component, second-order, and third-order harmonic compo-
nents of the response. Since only up to the third-order Volterra series
expansions were considered, the method is not capable of predicting
high-order harmonics.
The CPU time for computing the distortion at a single frequency is 4.1
minutes on 450MHz, 256MB Sun Sparc stations (Matlab implementa-
tion) while SPICE consumed 2.78 hours. The efficiency gain from using
the proposed method is evident.
To demonstrate the efficiency gain obtained from using the frequency
reversal theorem in the distortion analysis of periodically switched non-
linear circuits, the same circuit was solved with frequency reversal the-
orem implemented and without (brute-force). The results are tabulated
in Table 12.9. It is seen that the results from both methods agree well.
The efficiencies of the two algorithm are also compared in terms of their
samples were discarded from FFT analysis. Also the number of samples used in FFT analysis
was 64k. Rectangular window was employed.
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