FFT Analysis of Amplitude Frequency Response of Quadripoles Using a Square Waveform Reference Input Signal

In the following article an interesting approach to analyze the amplitude frequency response of quadripoles by using square reference input signal is hereby proposed. Any square waveform signal apart from deterministic parameters such as amplitude, frequency, period and ratio of a duty cycle can be represented as a sum of unlimited harmonic components. Thus, if a square waveform signal is applied to the input of a quadripole, its output signal will be a sum of the harmonics convolved by the quadripole. Thus, by Fast Fourier transform of the output signal can be decomposed of multiple harmonic components thus giving correct information regard amplitude and phase. The performed simulation studies confirm the effectiveness of the proposed approach.