Topics:
PPT Slide
Maximum Coupling Length
Critical Lengths for 100 pS Risetime
Amount of Crosstalk
Design 1 - Good Design
Design 2 - Still Good Design
Design 3 - Much more coupling
Design 4 - Thicker Metal
Design 5 - Remove one Ground
Design 6 - Holes in Ground
Design 7 - Circular Conductors
How long are they?
“Hey Buddy! You’ve got your directions mixed up.”
Vias Through Ground Planes
Equivalent Circuit - No Planes
What to Do?
Make each layer thin
Reduce Er
Examine Signal Patterns
Pattern 1 - 3:1 Chevron
Pattern 2 - 3:1 Checker Board
Pattern 3 - 1:1 Checker Board
Inside Package - 1:4 Pattern
Practical Experience
5x5 Array Example
Equivalent Circuit
Wave / Particle Duality
Speedup Trick
Conclusions:
Vias Through Power & Ground
Email: richard@wheeler.com
Home Page: http://www.wheeler.com
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