Characteristics of Line Filters
- A line filter may be used to attenuate EMI in either direction. For example:
- Emissions: It may be used to reduce the unintentional conducted emission from the equipment, to a level sufficiently low to pass regulatory limits (such as FCC part 15). For example, in switching power supplies.
- Immunity: It may be used to reduce the level of EMI entering the equipment, to a level sufficiently low not to cause any undesired behavior. For example, in equipment used in Radio Transmitter facilities
- The attenuation of Line filters is measured in 2 areas:
- Common Mode - attenuation to signals that appear identically on each of the wires going through the filter
- Differential Mode - attenuation to signals that appear on just one of the lines
- For each Mode, the attenuation is characterized over the frequency spectrum, and measured in dB
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