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Wavelet analysis of current measurements for mixed-signal circuit testing

In this paper a test method based on the wavelet transformation of the measured supply current (Ips) and load current (IL) waveforms is presented. In the wavelet analysis, the test metrics used are utilizing the initial three decomposition levels of the measured signal. Experimental comparative results between the proposed method, a test method based on the RMS value of IPS, a test method utilizing the harmonic magnitude components of the IPS spectrum and a method based on the wavelet transformation of the IPS are presented showing the effectiveness of the proposed testing scheme.