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Receptors are devices that detect and are affected by the interference emitted by the source. This can cause noise to be picked up by other equipment being powered from the same line. The second is a conducted path, where the signal travels through the conductors of the system such as PCB traces, component leads, and input wiring. The first is a radiated path, where electromagnetic energy propagates through space and couples with other systems. When a source produces noise, there are two possible paths it can travel. This includes power supplies, microprocessors, video drivers, RF generators, and other similar devices. Sources refer to devices or circuit nodes that generate electromagnetic interference. There are typically three key components in electromagnetic compatibility (EMC): sources, paths, and receptors. In this article, we will discuss how to choose the right EMI filter for your design, including EMI filter design and calculation with an example.ĮMI and Electromagnetic Compatibility (EMC) EMI filters are designed to reduce or eliminate these unwanted signals, but choosing the right filter for a particular design can be a challenging task. The fast switching of high voltage and current nodes leads to relatively large di/dt values within the circuit, resulting in emission of EMI noises. Switch-mode power supplies are notorious for injecting EMI into the transmission line. EMI (electromagnetic interference) is a common problem in electronic circuits that can cause unwanted noise and interference in electrical devices.