Abstract
Chirp-matched filters are used for spectral analysis of signals. In a chirp-matched filter spectrum analyzer, the output of the matched filter contains both the amplitude and phase information of the input signal. To extract the amplitude information, an envelope detector, which is composed of a full-wave rectifier and a low-pass filter, is used at the matched filter output. However, a proper choice of bandwidth of the lowpass filter is essential to extract the required amplitude spectrum from the matched filter output correctly. The approximate and the true outputs of the matched filter of a modified chirp-matched filter spectrum analyzer have been full-wave rectified and analyzed, to determine what bandwidth should be chosen for the lowpass filter for extracting the desired amplitude spectrum.
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