A modified EMI noise source impedance modeling by employing two resistances calibration and Levenberg-Marquardt's method

In order to design a effective EMI filter, noise source impedance (complex impedance) is very crucial, but actually, the result is low accuracy and no phase by employing traditional approaches. In the paper, a modified EMI noise source impedance modeling is proposed to investigate the characterization of EMI source impedance. The test shows that suggested method is more accurate and effective. Moreover, both amplitude and phase can be obtained.