Problems that arise when implementing an RF filter in modern signal interfaces are discussed. Effectiveness of filters under realistic impedance conditions, via peripheral cables in comparison to the 50Ohm-system are shown. Filter topologies are compared, the influence of filter design and peripheral cable impedance are explained. Filter topology adapted to the system, suitable components and an RF-compatible construction including layout are discussed. Critical points such as signal bandwidth, reference ground, coupling possibilities, filter construction and PCB layout are considered.
This presentation was part of Würth Elektronik virtual conference (25-28 Oct.): WE meet @ EMC Digital Days 2021