Multilayer printed circuit boards have proven to be recurrent abettors of electromagnetic coupling problems created by the incessantly faster response times in integrated circuit technologies. Coupling within multilayer boards has not only inhibited meeting certain EMI requirements but has also precipitated 'self-inflicted' malfunctions commonly experienced during development of avionic systems. A recent avionic system, interfacing two asynchronous processors through a fourteen-layer motherboard, permitted coupling through ground plane connector apertures of sufficient amplitude and duration as to cause unintentional intercommunication and system malfunctions. The coupling mechanism and ground plane modifications which reduced this coupling by 40 dB and eliminated the incompatibility are discussed in this paper.
Effective electromagnetic shielding in multilayer printed circuit boards
Eine wirksame Abschirmung von Mehrschichtschaltungen gegen elektromagnetische Stoerstrahlung
1981
4 Seiten, 4 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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