ELECTROMAGNETIC COMPATIBILITY ENGINEERING

Presented by: Henry Ott Consultants


This two-day course covers the practical aspects of noise and interference control in electronic systems.  It is a shortened version of our three-day Electromagnetic Compatibility Engineering course.  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 the knowledge necessary to design electronic equipment which is compatible with the electromagnetic environment, and is in compliance with national and international EMC regulations.

Participants will receive a three-ring binder containing lecture notes.

Prerequisite: A basic understanding of electronic circuits. No prior EMC experience is required.


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 reference 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 plane isolation, effect of paralleling capacitors.  Embedded PCB capacitance.


 

DIFFERENTIAL-MODE EMISSION
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

MIXED-SIGNAL PCB LAYOUT
What is the problem? A/D converter requirements, return current paths, split ground planes, PCB partitioning, bridges and moats, routing disciplin. 

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

February 23, 2009