Design for EMC

Day 1 – introduction and theory

Introduction to EMC; IEC, EN and MIL test standards
Why EMC? – the definition of EMC – the various phenomena – the product life cycle and reliability aspects – the EMC and R&TTE Directives – other Directives – military and aerospace requirements
The standards regime – standards generating bodies – military/aerospace versus commercial – content of the most common test standards
Principles of interference coupling
Using the dB – frequency versus time domain – coupling modes – electric, magnetic and electromagnetic fields – transmission lines – general emissions and immunity control
System partitioning and grounding
System partitioning – ground as a current return path – control of loop area – current flow in a ground plane and a shield surface – the effect of slots and apertures – conductor impedance and bonding – partitioning the circuit from the interface
Case study: current paths in ESD and EFT events
Day 2 – Mechanical, PCB and cables

PCB layout
Grounding and track impedance – proximity of return path – gridded and ground plane layouts – the optimum ground plane – on-board shielding – interface layout and grounding – layer stack-up
Cables and connectors
Mode of propagation – unscreened cables: twisted pair, ribbon – cable balance and LCL – screened cables: screen operation, transfer impedance – the effect of the connector – cable installation
Shielding
Theory of reflection and absorption – effect of apertures and seams – conductive gaskets – conductive coatings and shielded windows – partitioning shielded enclosures – using the shield as ground – cable layout and large enclosures
Exercise and case study – mechanical, PCB and cable design review
Day 3 – Electronics

Digital and analogue circuit design
Emissions from digital circuits: clocks, transmission line ringing, decoupling, using single chip micros, using complex microprocessors – emissions from analogue circuits: unanticipated oscillations, video signals – logic circuit immunity: timing and logic threshold constraints, transient susceptibility, defensive programming – analogue circuit immunity: bandwidth, linearity and dynamic range, balance, isolation
Power switching circuits
Emissions from switching circuits – coupling paths – differential and common mode conducted – radiated – construction techniques: screens, transformers
Filtering and suppression
Filter configuration and layout – component imperfections – ferrites on cables and within the circuit – I/O filtering – mains filtering – transient and motor suppression
Exercise and case study: electronic product design review
Wrap up and final discussion.

Delivery:	In house
Category:	Electrical