EMI/RFI Filters (LC, RC Networks)EMI/RFI filters are a type of electrical filter that is used to reduce the emission or susceptibility of electronic devices to electromagnetic interference (EMI) or radio frequency interference (RFI). EMI and RFI are types of electromagnetic noise that can interfere with the operation of electronic devices, causing unwanted effects such as signal degradation, data errors, or system failures. EMI/RFI filters are typically designed to attenuate or block specific frequency bands, while allowing the desired signals to pass through. They may be used at the input, output, or intermediate stages of a circuit, depending on the specific application and requirements. EMI/RFI filters are available in a variety of different configurations, including LC, RC, and LC-RC networks, which use inductors, capacitors, and other passive components to provide the desired filtering characteristics. EMI/RFI filters are commonly used in a wide range of electronic systems, including computers, communications equipment, and industrial control systems.