ADI的高速PCB设计
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The World Leader in High Performance Signal Processing Solutions
A Practical Guide to
High-Speed Printed Circuit
Board Layout
Agenda
Overview
Schematic
Location location location
Location, location, location
Power supply bypassing
Parasitics
Ground and power planes
Packaging
RF Signal routing and shielding Summary
Overview
PCB layout is one of the last steps in the design process and often one of the most critical
High-speed circuit performance is heavily dependant on
High speed circuit performance is heavily dependant on layout
A high-performance design can be rendered useless due to a poor or sloppy layout
poor or sloppy layout
Today’s presentation will help:
p y p
z Improve the layout process
z Ensure expected circuit performance is achieved
z Reduce design time
L t
z Lower cost
z Lower stress for you and the PCB designer
The World Leader in High Performance Signal Processing Solutions
Schematic
Schematic
A good layout starts with a good Schematic! Schematic flow and content
Include as much information as you can
Include as much information as you can
What should you include?
Items to Include on a Schematic N t
Notes
Component tolerances and case sizes
Part numbers (internal/external/alternative)
Board stack up
Tests or alignment procedures
p
Power dissipation
Controlled impedance and line matching
Component de-rating
Thermal requirements
Thermal requirements
Keep outs
Mechanical considerations
Critical component placement
Critical component placement
Warning flags
What ever else you can think of!
Schematic
The World Leader in High Performance Signal Processing Solutions
Location, location, location! Location location location!
Location, Location, Location
Location Location Location
Just as in real estate location is everything!
Input/output and power connections are typically defined…Everything else is undefined
d fi d E thi l i d fi d
z Critical component placement
Signal routing
z Signal routing
z Circuit and component proximity
The World Leader in High Performance Signal Processing Solutions
Power Supply Bypassing
Power Supply Bypassing
Bypassing is essential to
high speed circuit
p
performance
Capacitors right at power
supply pins
Capacitors provide low AC
z Capacitors provide low AC
impedance to ground
z Provide local charge storage
for fast rising/falling edges
f f t i i/f lli d