Applying Practical EMI Design and Troubleshooting Techniques

16 May 2023 - Introduction

Section 1: Measuring and Inducing noise

• The electrical noise model
• Distinguishing the four noise paths by name, electrical driving function, necessary physical features, and impact of source to victim distance
• Troubleshooting techniques based on the noise model
• Far-field versus Near-field coupling + DEMONSTRATION
• Practical antenna theory for radiated emissions and immunity + DEMONSTRATION
• Problems inherent in predicting radiated emissions and radiated immunity test results
• Conducted emissions—mode separation, LISNs, troubleshooting
• Practical applications

Section 2: Understanding the Physics and Root Causes of Noise Problems

• Capacitance—in ESD, PD boards, decoupling networks, filter networks, cables + DEMONSTRATION
• Electrostatic discharge (ESD). IC and system ESD tests. Problems with test repeatability. Design techniques to improve PCB ESD immunity + DEMONSTRATION
• Inductance—in PC boards, connectors, ICs, high speed signal paths, decoupling networks,
• How to use connectors for improved signal quality, reduced emissions, & improved immunity
• Behaviour of current paths at low and high frequencies + DEMONSTRATION

17 May 2023

Section 3: Modelling the Four Noise Coupling Paths with Lumped Element Schematics Functions of “Ground” and “Ground” Loops.

• Common impedance - in PCB power planes, ground planes, cables
• Capacitive - in PCB power filtering, transformers, heatsinks, connectors +DEMONSTRATION
• Inductive - in PCB ground planes, connectors, and IC packages
• Radiative - from small electronic products
• Function and definition of “ground”. Distinguishing ground from signal return in PCB and system design.
• Diagnosing the two types of ground loops. How to design to avoid ground loops.

Section 4: Optimum Use of EMI Control Components

• Control components: capacitors, inductors, ferrite beads, common-mode filters +DEMONSTRATION
• Coping with and improving non-ideal characteristics such as interconnect inductance, DC bias
   

Section 5: Measuring and Diagnosing Effects of Common and Differential-Mode Sources and Filters

• Differential-mode current, voltages
• Common-mode currents, voltages, +DEMONSTRATION
• Understanding the common-mode current and antenna path for emissions and immunity
• Antenna currents and relevance to filter networks and troubleshooting
• Common and differential-mode filtering. Filter network topology and function
• Inherent difficulties in EMC filter design. Effects of filters on intended and unintended signals

Test and measurement equipment for this course is supplied by Rohde & Schwarz 

Participants who attend the full course will receive a University of Oxford certificate of attendance. This will be presented to you prior to the end of the course wherever possible.

The certificate will show your name, the course title and the dates of the course you attended.

Fees include course materials, tuition, refreshments and lunches. The price does not include accommodation.

All courses are VAT exempt.

Register immediately online 

Click the “book now” button on this webpage. Payment by credit or debit card is required.

Request an invoice

If you require an invoice for your company or personal records, please contact the course administation team to request an application form. Payment is accepted online, by credit/debit card, or by bank transfer. Please do not send card or bank details via email.

After attending this course you will be able to:

• Systematically analyze and solve noise problems by using the noise model to create and analyze a noise circuit schematic
• Minimize radiated EMI by designing low inductance signal interconnects
• Understand ground loops, how to represent them in an equivalent circuit, and how to eliminate them
• Clearly identify and manage the different types of "ground" in schematics and physical circuits
• Identify "accidental antennas" in new designs
• Understand, measure, and reduce common-mode current in emissions and immunity, and functional noise problems
• Improve the quality of sensor and instrumentation signals in the presence of noise

Digital logic designers, analogue designers, technicians, EMC specialists, printed circuit board designers, applications engineers; anyone working with electronic circuits who is concerned with the control of low and high frequency electrical noise in electronic systems.

This course is for Digital Logic Designers, Analogue Designers, Technicians, EMC Specialists, Printed Circuit Board Designers, Applications Engineers; anyone working with electronic circuits who is concerned with the control of low and high frequency electrical noise in electronic systems.