Aims: To provide an introduction to the fundamentals of EMC.
Learning Outcomes:
After completing this module students should be able to: demonstrate and understand the terminology used in EMC; explain the cause of interference in terms of the interaction of charges, currents and fields.
Skills:
After completing this unit students should be able to: identify interference problems and suggest solutions; demonstrate the use of EMC principles for interference free design. Taught facilitated and assessed.
Content:
Revision of electromagnetic field theory. EMC terminology, electromagnetic emissions (EME), electromagnetic susceptibility (EMS), electromagnetic interference (EMI). Sources of disturbances,
man made sources, natural sources. Levels of EMC, component, circuit, device, system. Coupling paths, common impedance, capacitive coupling, inductive coupling, radiation, electric dipole (small), magnetic dipole
(small), radiation through an aperture. Common mode and differential mode signals, filtering. Properties of conductors, DC and AC current flow, skin depth, AC resistance, inductance (internal and external). Shielding. Inductive crosstalk, capacitive crosstalk, near end crosstalk. Effect of nearby conducting plane. Parasitic effects in components, resistors, capacitors, inductors, transformers. Protective earth and signal reference, earth loops. Effect of ESD. Choice of signal reference and cabling.
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