Screening attenuation of differential cable-connector assemblies

Abstract

High speed data transmission is now required in many applications. One limiting factor on speed can be radiated emissions. This paper presents simulation and measurement results on electromagnetic leakage of various differential cableconnector assemblies. Leakage modelling aspects are also considered. Ditferential and common mode interferences as well as single and double shielded assemblies where grounding pin number directly connected to the cable screen varies are studied. The research methods are FIT simulations and absorhing clamp measurements. It is shown that Ihe symmetry ofthe differential shielding is important and to suppress common mode interferences high amount of grounding pins is required when unscreened connectors like typical high-speed digital ones are used. Double shielded assemblies leak much less. 0-7803-8470