ADI官方高速信号布线技巧指南

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 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