The impedance mismatch of EMI filter always make the filter can not play the expected role, on the contrary, it intense the strength of interference component. In order to understand the rektion between active filter structure and impedance match, this paper derivated the rektion between insert loss expression of different type active filter and the impedance and filter gain based on the basic definition of filter main performance. According to the above work, the best combination for filter type and impeda...
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