15 June 2021 - 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 + DEMONSTRATTION
- 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
- Behavior of current paths at low and high frequencies + DEMONSTRATION
16 June 2021
Section 3: Modeling 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