PC Board Layout Techniques for

The Art of PCB Design
Good PCB design is a discipline that takes
years to master.
Reliable High-speed, mixed-signal designs
require a great deal of theoretical
knowledge and practical understanding to
be done properly.
We’ll cover many important concepts at a
high level today.
Agenda
PCBs 101
Good High-Speed PCB Design Practices
The Power of Power and Ground planes
Proper use of decoupling capacitors
The True Nature of Resistors and Capacitors in High-speed Designs
High-speed Signal Propagation - Wires or Transmission Lines?
Impedance Mismatches, Series and Parallel Termination
Managing EMI
Mixed Signal PCB Layout
Grounding Mixed Signal Data Acquisition System
Ground Plane in Mixed Signal Designs
Power Filtering & decoupling
Parasitic Consideration
Control Differential line impedance
 Small Signal Layout
Consider Track Resistor Loss
Proper grounding shielding cable
Minimize PCB Leakage by Guard Ring
Prevent PCB Heating Temperature Sensors
PCB Basics
PCB Units of Measurement
PCB methodologies originated in the United States
Units of measurement are therefore typically in
Imperial units, not SI/metric units.
Board dimensions are commonly measured in inches.
Dielectric thickness & conductor length and width typically
measured in inches and “mils”.
1 mil = 0.001 inches
1 mil = .0254 mm
Conductor thickness measured in ounces (oz).
The weigh of conductor metal in a square foot of material.
Typical thickness
0.5oz = 17.5μm
1.0oz = 35.0μm
2.0oz = 70.0μm
3.0oz = 105.0μm
PCB