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
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17 June 2021
Section 1: PCB Noise Models
- Review of the noise coupling model
- Review of the four noise coupling paths
- Emissions and immunity
Section 2: Capacitance, Inductance and Current Paths in PC Boards
- Good and bad capacitance
- Good and bad inductance
- Current loops
- Low versus high frequency current paths
- Inductance and low versus high frequency current paths + DEMONSTRATION
- “Ground plane” splits - appropriate and inappropriate uses
- Connectors, cables, and I/O wires connected to the PCB
Section 3: Signals on PC Boards
- Which signals are important?
- What do they look like? + DEMONSTRATION
- Transmission lines, characteristic impedance, terminations + SIMULATIONS
- Harmonic content versus duty cycle + DEMONSTRATION
Section 4: Power Distribution
- Functions of PCB “grounds”
- Voice noise
- Decoupling and filtering
- Board layer stack-ups
- Funny design ideas, current research, new design applications
Section 5: Design Techniques and Examples
- Component placement
- Signal routing + stackup
- Examining vendor applications notes that give bad EMC advice for PCB design
- Examining past SILENT PCB design review findings
Test and measurement equipment for this course is supplied by Rohde & Schwarz