Spectrum Amplitude of Step-Like Waveforms Using the Complete-FFT Technique

The complete Fast Fourier Transform (FFT) technique for the computation of the spectrum amplitude of step-like waveforms is presented in this paper. The complete FFT technique offers an enhanced resolution, and produces a dc and equally spaced harmonic components for the spectrum amplitude. The technique is applied to an analytical waveform in order to discuss its accuracy and analyze the associated errors. It is also applied to an experimentally acquired waveform for demonstration purposes.