A thin film common mode noise filter and its evaluation by wavelet analysis

With the development of modern electronic switched mode power supplies, greater attention is being focused on line noise problems. To overcome this difficulty, we have previously proposed a resonant type inductor having a noise filtering capability. In the present paper, we develop a film filter implementation of a resonant type inductor. Also, we employ a wavelet analysis technique to evaluate the noise filtering characteristics of the filter. The thin film shape inductor was designed and was used eliminate the line noise caused by a switched mode power supply.