EMI filter (electromagnetic interference filter) also known as RFI filter, is an electronic passive device which is used in order to suppress conducted interference that is present on a signal or power line. Electromagnetic Interference (EMI) is unacceptable electromagnetic emissions, natural or man-made, which result in the degradation or malfunction of electronic equipment. EMI filters can be used to suppress interference that is generated by the device. Most EMI filters consist of components that suppress differential and common mode interference.
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