Basic Digital Design

 This one day seminar covers the electromagnetic compatibility (EMC) concerns for digital logic systems operating with clock frequencies up to a few hundred MHz.  The seminar covers important design parameters and printed circuit board layout features, including the characteristics of different ground structures and the effectiveness of  various methods of decoupling.  In addition, models are developed for both differential-mode and common-mode radiation mechanisms, as well as the techniques used to control them.  Other topics include PCB transmission lines, reflections, and various termination methods.

 Although primarily aimed at electrical engineers; mechanical engineers, technicians, and printed circuit board designers have also found the material useful.


Digital Circuit Layout and Grounding

How is Digital Logic Noise Generated?
Ground Inductance
---Ground Grids
---Ground Planes
The Effect of Slots in Ground Planes
---Equivalent Circuits
---Decoupling Network Resonance
---Effectiveness vs Frequency
Bulk Decoupling Capacitors
Power Entry Filters

High Speed Digital Decoupling

Alternative Decoupling Methods
Capacitor Value
Capacitor Placement
Paralleling Capacitors
Decoupling Examples
Distributed PCB Capacitance
Vcc Isolation

Digital Circuit Emission Modeling

Differential-Mode Radiation
---Loop Antennas
---Controlling Differential-Mode Radiation
---Clock Circuit Guidelines
---Cancellation Techniques
Common-Mode Radiation
---Dipole Antennas
---Controlling Common-Mode Radiation
---Common-Mode Cable Currents
---Measuring Common-Mode Currents
---Reducing the Common-Mode Potential
---Cable Shielding

Transmission Lines

Transmission Line Effects
---PCB Transmission Lines
---Line Termination Methods
---Transmission Line Reflections

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Henry Ott Consultants
48 Baker Road Livingston, NJ 07039
Phone: 973-992-1793,   FAX: 973-533-1442

October 18, 2002