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:

Program

1/ Introduction

• EMC characterisation of equipment

• Common mode/differential mode

• Representation of a sinusoidal/trapezoidal signal

• 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 filters

• Routing of differential links



6/ Transmission lines

• Definitions

• Impulse reflection line

• Signal shapes

• The eye diagram

• Eye 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