Common Mode Filters

Common mode filters are electronic devices that are used to reduce the common mode noise that can be present in electronic systems. Common mode noise is a type of electromagnetic interference (EMI) that affects the signals in a circuit in the same way, rather than differentially as in normal mode noise. Common mode filters typically consist of a transformer or other inductive element that is connected between the signal source and the load, and are designed to pass the desired signals while blocking or attenuating the common mode noise. They are often used in applications such as power supplies, motor drives, and communications systems to improve the signal quality and reduce the risk of EMI-related problems.