EMI CATALOG
●Overview of EMC/RFI Issues
■The phenomenon of electromagnetic interference (EMI) is familiar to virtually everyone, even if they do not understand the underlying principles. Most people have witnessed firsthand the effects of interference.
■To control EMI, government organizations, such as the FCC, CSA, and EEC, mandate that manufacturers may not design, produce or sell electronic equipment that jams the public broadcast services. In other instances, however, EMI can constitute more than a mere nuisance. The military and medical communities, for example, require trouble-free operation of their electronic equipment in adverse electromagnetic environments since malfunctions could jeopardize missions and personnel.The European Union's EMC directive also mandates that "the apparatus has an adequate level of intrinsic immunity to electromagnetic disturbance to enable it to operate as intended".
●EMC Design of High Speed Systems
■The interference and susceptibility (immunity) effects of electronic apparatus are created by time-variant electromagnetic fields which may be propagated along a conducting medium or by radiation through space Because the source of the conducted and radiated interference energy levels may be related, a coordinated
systems design effort is required to reduce these effects.
■A design program for an equipment item that must meet both an emission and an immunity requirement consists of:
▲Suppression: Reducing the interference at its source.
▲Isolation: Isolating the offending circuits by filtering, grounding and shielding.
▲Desensitization: Increasing the immunity of any susceptible circuits.
■These three steps should be carried on throughout the entire equipment design and implemented as early as possible within the design program.
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