EMC Design Seminar Course Outline

Roger

Days 1-3: EMC Design Class, Lecture and Discussion
Day 3: Workshop using computer programs designed by the instructors
Note: Wear casual business attire. Prepare for moderate temperature variation in the room.

Day 1

  1. Introduction to EMC
    1. Why you need to consider EMC in your design
    2. The Real World and EMC Test Standards
      1. FCC and Canadian EMC Requirements
      2. European EMC Directive
      3. MIL 461 and RTCA EMC requirements
      4. Other world EMC regulations
      5. Real world measurements and levels
  2. Interference Overview
    1. Typical Noise Path
    2. Wavelengths, bandwidths and dB's
    3. Overview of radiated interference
  3. Grounding
  4. Cabling - principles from crosstalk to how shielding works
  5. Passive components
  6. Electric and magnetic fields from simple circuits
  7. Fields radiated by non-sinusoidal sources
  8. General strategy for low emission product design

5:00-6:30pm Laboratory Tour
Optional tour of a modern EMC test facility

Day 2

  1. Controlling radiated emissions at the device
  2. Digital circuit noise and layout
  3. Control signal return currents on PCB's
  4. Learn how EMC and signal integrity are interrelated
  5. Filtering - how filters work and how to design your own using Pspice
  6. Emission control in motherboards & backplanes
  7. Hands-on calculations made throughout the day
  8. Controlling radiated & conducted emissions from switch mode power supplies
  9. Reducing emissions from cables and packaging
  10. Calculating emissions for a digital circuit
  11. Shielding
  12. Calculation of emissions from enclosures
Source to Load
Current density at 1 MHz from source to load
Two capacitors
Current changing planes using two capactiors

Day 3

  1. Troubleshooting radiated & conducted emissions
  2. Electrostatic Discharge (ESD)
  3. Case study and validation of results
  4. The Workshop
    Using an example of a real life product and following typical design principles, students will:
    1. Develop a block diagram
    2. Determine the product's EMC parameters
    3. Using our proprietary computer programs (a copy of which you will take home) calculate the probable emissions characteristics of the:
      1. circuit boards
      2. power supply
      3. I/O lines
      4. enclosure

While meeting the North American and European EMC regulations, students will design/analyze a unit consisting of:

  1. A motherboard with microprocessor, clocks, digital inputs and outputs
  2. A power supply
  3. Cables with and without shielding for the digital and analog inputs and outputs
  4. An enclosure
  5. An external keyboard
  6. An interface to a video monitor

Students will go through the product's requirements and calculate its estimated emissions providing rationale for various decisions.

When you leave this seminar/workshop, you should be ready to lead a design team with a high degree of confidence that your products will meet their EMC requirements.

Included with the seminar/workshop:

  1. A large workbook of the slides used in class
  2. Worksheets to do the calculations
  3. Computer software to calculate harmonics emissions from PCB, cable emissions & cabinet shielding
  4. Textbook Controlling Radiated Emissions by Design, 3rd edition
  5. Specific sample problems and calculations
  6. Lunch each day

What to bring:

  1. Your desire to learn
  2. Calculator
  3. A laptop running Word, Adobe Acrobat, Excel and a CD/DVD drive. (A laptop is useful, but not required)

 

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