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Design Considerations for Gigabit Backplane Systems

Table of Contents:
Definition and Overview
1. Introduction
2. Broadside versus Edge-Coupled Differential Pairs
3. Point of Diminishing Returns: Line Width Increases
4. Mechanical Materials Properties
5. Launch Issues
6. System Measurements
7. Conclusion
8. Appendix
Self-Test
Glossary
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Self-Test
1. For the study presented in this tutorial, _________ Gbps was chosen as the data rate for sample system comparison.
a. 1.25
b. 2.5
c. 3.5
d. 5
2. Which of the following differential trace topologies demonstrates marked superiority?
a. broadside-coupled lines
b. edge-coupled lines
c. neither
3. _______________ percent risetimes are a better indicator of conductive losses.
a. 10 to 50
b. 20 to 80
c. 10 to 90
4. _______________ percent risetimes are a better indicator of dispersive losses.
a. 10 to 50
b. 20 to 80
c. 10 to 90
5. At high frequencies or fast data rates, using lower loss materials yields more dramatic results than increasing line widths.
a. true
b. false
6. Material losses amalgamate with copper losses.
a. true
b. false
7. New low-loss material processes and mechanical attributes are much the same as FR–4 and should not be a consideration or concern in new designs.
a. true
b. false
8. In order to realize a large electrical advantage from a padded surface mount interconnect system, use it in conjunction with blind and buried or micro-vias.
a. true
b. false
9. When individual components are integrated, overall performance will behave the same as the sum of the individual components.
a. true
b. false
10. Standard PTHs for press-fit pins suffer which of the following problems?
a. increased costs as compared to micro or blind and buried vias.
b. electrical degradation caused by capacitance and stubbing effects.
c. additional capacitance from large surface pads.
Glossary >>

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