Split Backplane Alignment Bar for Signal Integrity
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Solution Overview
Problem
Conventional backplane designs in networking and computing systems are costly and difficult to manufacture due to the combination of signal and power layers, leading to increased thickness and area, which can cause signal integrity issues and limit manufacturing capabilities.
Innovation Solution
A split backplane design separates power and signal backplanes with an alignment bar for precise alignment and stiffening, allowing modules to connect to both, reducing layer count and surface area, and using thin and thick dielectric layers respectively for high signaling rates and current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal and power layers are combined in a single backplane, then connectivity functionality is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The backplane is divided into two separate components: a signal backplane containing signal layers and connectors, and a power backplane containing power layers and connectors. This segmentation reduces the complexity of each individual backplane, making them easier and less costly to manufacture while maintaining all necessary connectivity functionality through their combination.
2Power
If multiple power layers are added to support high current distribution, then current distribution capability improves, but backplane thickness increases
Solution Approach 1:
Power layers are concentrated in the power backplane rather than being distributed across a single thick backplane. This allows the signal backplane to maintain thin thickness for signal integrity while the power backplane provides robust current distribution through dedicated thick power layers.
3Area of stationary object
If backplane area is reduced, then manufacturing flexibility improves, but connector hole thickness increases affecting signal quality
Solution Approach 1:
The backplane is segmented into signal and power portions, allowing the signal backplane to be optimized for signal integrity with appropriate thickness and area, while the power backplane handles current distribution. This enables independent optimization of each backplane's dimensions for its specific function.
4Reliability
If alignment precision between backplanes is improved, then connector pin reliability improves, but manufacturing complexity increases
Solution Approach 1:
An alignment bar serves as an intermediary component between the signal backplane and power backplane. The alignment bar includes alignment features that precisely position the two backplanes relative to each other, ensuring connector pins align correctly without requiring complex alignment mechanisms in the backplanes themselves.
Solution Approach 2:
The alignment bar replicates alignment features on both the signal backplane and power backplane, creating a standardized interface that ensures precise alignment. By copying alignment geometries onto the alignment bar, the system achieves reliable connector pin alignment through a simple, repeatable mechanism.
Data Source
AI summary
A split backplane for a telecommunication, networking, or computing device includes a power backplane comprising power connectors; a signal backplane comprising signal connectors, wherein the signal backplane is separate from the power backplane, and wherein one or more modules are adapted to selectively connect to the power connectors and the signal connectors simultaneously; and an alignment bar connected between the power backplane and the signal backplane for alignment and stiffening of the power backplane and the signal backplane together for signal integrity and to prevent connector pins from bending or failing between the one or more modules, the power connectors, and the signal connectors.