(Electromagnetic Interference), there are two types of conducted interference and radiated interference. Conducted interference refers to the coupling (interference) of a signal on an electrical network to another electrical network through a conductive medium. Radiated interference refers to the coupling (interference) of the interference source to another electrical network through space. In high-speed PCB and system design, high-frequency signal lines, integrated circuit pins, various connectors, etc. may become radiated interference sources with antenna characteristics, which can emit electromagnetic waves and affect the normal operation of other systems or other subsystems in the system. Since the emergence of electronic system noise reduction technology in the mid-1970s, mainly due to the US Federal Communications Commission in 1990 and the European Union in 1992 proposed regulations on commercial digital products, these regulations require companies to ensure that their products meet strict magnetic susceptibility and emission criteria. Products that meet these regulations are called electromagnetic compatibility EMC (Electromagnetic Compatibility).
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