Modern guide to spectral analysis with SPICE

Either SPICE´s own command or a post-processor applying an FFT can be used to deliver a high-quality spectral analysis, provided attention is paid to ensure that circuit settling time is adequate, that the signals are harmonically suitable or an appropriate window applied, and that the signal to be analysed is adequately sampled. While only a good understanding of the discrete and fast Fourier transforms will lead to fool-proof analysis, it is possible to tackle most situations by adhering to simple guidelines described here, We present our own post-processing algorithm. This is a relatively robust tool for performing spectral analysis on SPICE transient analysis output data