EMI/EMC Design Fundamentals

Course 288

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Summary

This course is being offered live online in 5 sessions over a five day period. Each daily session will last approximately 4 hours and start at 7:00 AM Pacific time. The first session will be presented on July 18 with the final session presented on July 22. The final session will last approximately 3 hours.

This course covers the methodology of designing an electronic product to minimize the possibilities of having problems of electromagnetic interferences (EMI) or Electromagnetic Compatibility (EMC). The course presents the ways in which an electronic system can generate and/or receive EMI causing failure to meet EMC regulations. A practical approach with many real world examples, techniques, simulation and hardware tools for EMI design will be explained to minimize costs, production and marketing delays considering EMI in the design phase.

Learning objectives

Upon completing the course you will be able to:

• understand the basics and fundamentals of EMI/EMC issues, • design electronic equipment to avoid common EMI/EMC failures, • look at the high frequency fundamentals of EMI, modelling the problems to be able to propose solutions, • use lab measurements and tools to find or fix typical EMI/EMC problems, • reduce time and cost of EMI/EMC diagnosis and repair.

Target Audience

No prior EMI/EMC knowledge is needed but an electrical engineering background (BSEE or equivalent experience) is recommended.

This course will be of interest to:

• design and test engineers/technicians from the electronics industry involved in EMI/EMC problems. Analog, digital, RF, mechanical and system engineers and technicians interested in design process to avoid EMC problems, • those interested in a working knowledge of EMI/EMC engineering principles and concerned with EMC regulations, • laboratory personnel involved in measurement and troubleshooting of EMC failures, • managers responsible for design, production, test and marketing of electronic products, • marketing engineers who need a general and practical knowledge of the EMI/EMC basics.

Outline

Basics of EMI/EMC
 • Why EMI affects electronic systems • EMI/EMC classifications • Typical sources and victims • Coupling mechanisms • Spectrum of a signal • Time domain vs frequency domain • Near vs far field • di/dt and dv/dt • Frequency vs dimensions in EMI in EMI • Controlling signal return currents • Differential vs common mode currents • “Hidden antennas” radiation and pickup from loops and dipoles • The “hidden schematic” idea
Grounding
 • Signal ground versus safety ground • Ground in high frequency/speed applications: low impedance path • Minimizing ground impedance • Common impedance • Ground strategies (single point, multipoint, hybrid)
Filtering
 • Filters for EMI/EMC • How filters work: reflection vs dissipation • Insertion losses • Source and load influence • Parasitic and location effects • Filtering with ferrites • Saturation and undesired coupling effects • Decoupling and bypass fundamentals • Damping resonances and ringing • Three terminal and feed through components • Mains filters (differential mode and common mode) • Filter mounting and layout
Printed Circuit Boards (PCBs)
 • Basic ideas • Partitioning and critical zones • Choosing the PCB structure: how many layers and distribution • Power planes design and distribution • Layout and routing (1, 2 and multilayer) techniques • Traces, microstrip and stripline, corners, vias • controlling impedance, transmission line effects and solutions • Ground planes • Splits or ground discontinuities in planes (slots) • Decoupling and bypass (how, where, resonances, etc) • Crosstalk and guards • Examples
Shielding
 • Basic ideas • How shields work: reflection vs absorption • Influence of material • Shielding effectiveness • Low vs high frequency fields • Electric vs magnetic fields • How to destroy a shield • Holes and slots • Gaskets • Shield penetrations • Examples
Cables
 • Basic ideas for cables • Cables in EMI • Transmission lines in EMI • Crosstalk • How cables can radiate or pick-up • Cable impedance • Shielded cables • Types of cables - wires, twisted pairs, coax, shielded cables, ribbon cables, etc. • Examples
Diagnostic and Troubleshooting
 • Diagnostic and troubleshooting techniques and hints • Locating EMI sources • Examples and demos