EMC systems engineering

Summary form only given, as follows. EMC problems have plagued the communications/electronics industry since the late 1800´s. This is significant because these early problems preceeded the invention of the triode vacuum tube. When the amplificaiton of low level signals became possible the EMC problem became much worse because circuits could now respond to lower level interfering signals. Fortunately, there were few electronics devices to interfere! In the last 100 years, we have seen a proliferation of modulation schemes, active components, devices, and systems which has resulted in the creation of laws by various govermental agencies to protect our RF environment. To cost effectively comply with these Iztws requires a coordinated design effort between the electronics designers and the mechanicaYpackaging designers. This seminar provides an overview of the EMC problem, new governmental requirements, and systems design. The systems design presentation covers PCB design considerations, differential and common mode trace and cable EMC hardening, and shielding for RF emission and susceptibility (immunity) control. The shielding discussion covers aperture controls as well as mechanical and corrosion design. Shielding design is emphasized in this presentation because it can be applied to existing systems without impacting circuit operation. It is the only suppression technique that can be used in this way