ELECTROMAGNETIC COMPATIBILITY ENGINEERING

Presented by: Henry Ott Consultants


 This three-day course covers the practical aspects of noise and interference control in electronic systems.  It will provide the participants with a working knowledge of electromagnetic compatibility principles.  Emphasis is on cost effective EMC design for digital systems. The commercial and industrial aspects of EMC Engineering are emphasized.  The amount and complexity of mathematics will be kept to a minimum, and ideas will be illustrated with examples of actual case histories.

 This course is directed towards electrical engineers.  However, mechanical engineers, reliability and standards engineers, technical managers, systems engineers, regulatory compliance engineers, technicians, and others who need a working knowledge of electromagnetic compatibility engineering principles will also benefit from the course.

The participants should receive from this course knowledge necessary to design electronic equipment which is compatible with the electromagnetic environment, and is in compliance with national and international EMC regulations.

COURSE CONTENT

CABLING
Electric and magnetic field coupling, crosstalk.  Cable types: coax, twisted pair and ribbon cables.  Cable shielding.  Cable terminations.

GROUNDING PRINCIPLES
Why do we ground?  Ground systems: single point, multipoint, hybrid.  Ground loops.  Return current paths, split planes.   EMC grounding philosophy.  AC power grounds.

DIGITAL LAYOUT & GROUNDING
Noise Sources, PCB layout, power distribution, ground grids, characteristics of ground planes.  Decoupling capacitors; value, placement, resonance and limitations.

HIGH SPEED DIGITAL DECOUPLING
Alternative decoupling methods, use of distributed decoupling capacitance, power supply isolation, effect of paralleling capacitors.  Embedded PCB capacitance.

D-M EMISSION MODELING
Radiated emission mechanisms.  Fourier spectrum.  Differential-mode emission modeling.  Methods of controlling differential-mode emission.  Clock dithering.  Cancellation techniques.
 

 COMMON-MODE FILTERING
Basic C-M filter theory. Filter source and load impedances.  Single-stage filters.  Multi-stage filters.  Ferrite chokes versus shunt capacitors.  Effectiveness of different C-M filter configurations.  C-M filter mounting and layout

TRANSMISSION LINES
Transmission line effects, transmission line radiation, and matching. How current flows on transmission lines.

MIXED SIGNAL PCBs
Defining the Problem. A/D converter requirements, return current paths, split ground planes. PCB partitioning, bridges and moats, routing discipline.

RF & TRANSIENT IMMUNITY
RF immunity; circuits affected, PCB layout, audio rectification, RFI filters. Transient immunity; circuits affected, the three-prong approach, keeping transient energy out, protecting the sensitive devices, designing software/firmware for transient immunity.

CONDUCTED EMISSION
AC power line conducted emission models, switching power supplies, parasitic capacitance, layout.  Common-mode and differential-mode conducted emission, common-mode chokes, saturation.  Power line filters.

SHIELDING
Absorption and reflection loss.  Seams, joints, gaskets, slot antennas, and multiple apertures.  Waveguides below cutoff, conductive coatings.  Cabinet and enclosure design.


 
 

 

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Henry Ott Consultants
48 Baker Road Livingston, NJ 07039
Phone: 973-992-1793,   FAX: 973-533-1442

March 5, 2008