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高速电路设计__High-Speed_Board_Design
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2011-08-17
14:51:56
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高速电路设计__High-Speed_Board_Design
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Serial Gigabit Solutions
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Hi
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eed Board Desi
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Bill Simms
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High Speed Board Design
Layout and Routing
Filtering
Component Placement
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Board Stackups
Layer # 12345678910Comments
4 Layer S1 G P S2 Difficult to maintain high signal impedance
and low power impedance
6 Layer S1 G S2 S3 P S4 Lower Speed Design, poor power,
high signal impedance
6 Layer S1 S2 G P S3 S4 Default critical signals on S2 only
6 Layer S1 G S2 P G S3 Default lower-speed signals to S2 only
Preferred
8 Layer S1 S2 G S3 S4 P S5 S6 Default high-speed signals to S2-S3.
Has poor power impedance
8 Layer S1 G S2 G P S3 G S4 Best for EMC
Preferred
10 Layer S1 G S2 S3 G P S4 S5 G S6 Best for EMC. S4 susceptible to power
noise
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Layer Rules
Split Power and Ground Planes
20H Rule
Use Orthogonal Routing on Adjacent
Layers to Minimize Coupling
Use Ground Stitching Vias to Create a
Solid Ground
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