Electronic map tracing

Goals

formation-objectifs-seointro Electronic map tracing :

- Take into account all key EMC parameters for electronic card routing
The aim of this training course is to:
- Be able to avoid recurring layout and routing errors
- Be able to analyse different couplings
- Be able to master the routing of masses, power supplies and sensitive tracks
- Understand where and how to place protection and filtering components
- Understand the routing of impedance-controlled high-speed links

Program

1/ Introduction

EMC characterisation of equipment

Common mode/differential mode

Representation of a sinusoidal/trapezoidal signaldal

Time-frequency analogy

Evolution of printed circuits

Management and planning of a printed circuit

2/ Masses and power supplies

Common impedance coupling

Impedance of a ground plane

Return of HF currents

Slot in a ground plane

Impedance of a printed circuit board track

Star power supply

Analogue power distribution

Multilayer decoupling

Power mesh

Maximum track current

Power supply noise

Capacitor impedance

Multilayer decoupling

Ground plane/power plane

Flex

Mixed analogue/digital boards

Galvanic isolation

Connecting 0V to the chassis

3/ Sensitive tracks

Principle of capacitive coupling between board and chassis

Total capacitance between card and ground plane

Parasitic capacitance of tracks

Guard ring

Mechanical and thermal effect on voltage reference

Optimal distribution of CIP layers

Routing of sensitive tracks

Shorten the sensitive side

Component layout

Example layout

Track-to-track coupling

Screen track

Crosstalk in backplanes

What is a field?

Induced voltage in loops

Reducing the surface area of loops

4/ Electronics radiation

Radiation from a small loop

The two types of electronics radiation

Clock layout

Controlling vertical paths

Radiation from card edges / Backplane

Layout and tracing of tracks

Origin of common mode current

5/ Input/output protection

Capacitive filtering of inputs/outputs

Errors to avoid

Filter layout and routing Input-output crosstalk output filters

Routing of differential links

6/ Transmission lines

Definitions

Impulse reflection line

Signal shapes

The open-loop diagramil

Œil open and closed

Line topologies

When should a line be adapted?

Differential links

Propagation speed and delay

Greek delay

Calculation of characteristic impedance

RF Calc

Stub effect

Distributed impedance matching

Backplane problem



7/ Influence of manufacturing

Manufacturing tolerance

Increased copper losses due to roughness

Tropicalisation and circuit protection