What Is EMI?


Quick Answer

EMI stands for electromagnetic interference. It is the disruption of the normal operation of an electronic device caused by picking up electromagnetic signals from an external source. The most common form of EMI involves signals on the radio spectrum and is called RFI, or radio frequency interference.

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Full Answer

EMI often involves a device picking up electromagnetic signals from another, nearby device. For example, microwave ovens can interfere with wireless communication devices. EMI can be prevented in several ways. The device may be thoroughly shielded from all outside signals. The device may frequency hop, meaning that it periodically changes what signals it accepts. More advanced methods involve error-correcting when the device receives interference and designing the device to only accept a very narrow spectrum of signals from a particular direction.

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