OSFP-XD Interposer Board Direct Electrical Connections
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Solution Overview
Problem
Traditional methods for testing OSFP-XD transceivers face challenges due to space constraints and signal integrity issues caused by the number of RF coaxial cables and long high-speed signal traces, which are inadequate for handling the high channel density and signal rates of these transceivers.
Innovation Solution
A PCB interposer board with adjustable length connections between two OSFP-XD transceivers, eliminating the need for RF coaxial cables and connectors by providing direct, uniform, and shortest electrical connections through soldered or epoxied connectors and length-adjustable PCB traces and vias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional test boards with RF coaxial cables and long high-speed signal traces are used, then testing capability is provided, but space constraints and signal integrity deterioration occur
Solution Approach 1:
The patent extracts and eliminates RF coaxial cables and RF cable connectors from the test setup by implementing direct electrical connections through the interposer board. This removes the harmful elements (cables and connectors) that were causing space constraints and signal integrity issues, replacing them with integrated PCB traces and vias.
Solution Approach 2:
The patent merges the functions of multiple separate components (RF cables, connectors, and test board traces) into a single integrated interposer board structure. By combining these elements into direct electrical connections through PCB traces and vias, the system achieves simpler architecture while maintaining testing capability.
2Reliability
If RF coaxial cables and long high-speed signal traces are used, then electrical connections are established, but signal integrity deteriorates due to cable length and trace length
Solution Approach 1:
The patent removes long cables and extensive PCB traces from the signal path by implementing direct electrical connections through the interposer board. This extraction of unnecessary length elements directly improves signal integrity by minimizing the distance high-speed signals must travel.
3Productivity
If multiple RF coaxial cables are used to connect all high-speed signals, then all channels are tested, but space constraints are exceeded due to the sheer number of cables
Solution Approach 1:
The patent merges multiple cable connections into a single integrated interposer board structure. By consolidating all high-speed signal connections onto the board through direct electrical connections, the system maintains full channel density testing capability while dramatically reducing the physical space required compared to using individual RF coaxial cables for each channel.
Solution Approach 2:
The patent extracts and eliminates the need for numerous RF coaxial cables from the test setup. By replacing cable-based connections with integrated PCB traces and vias on the interposer board, the system maintains the ability to test all high-speed channels while removing the space-consuming cable infrastructure.
Data Source
AI summary
To establish direct electrical connections between two OSFP-XD transceivers, their connectors' footprints are specially aligned on opposite sides of a PCB board. The high-speed signal pads of the two footprints are precisely defined and connected through PCB traces and vias, according to specific configurations. The two OSFP-XD electrical connectors are then individually soldered onto their respective footprints. As a result, the electrical high-speed signals from the transceivers are directly connected via the specially defined connections in the shortest distance possible when the transceivers are plugged into their respective OSFP-XD connectors.