Floatable Electrical Connector for Blade Server Signal Integrity
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Solution Overview
Problem
Communication systems, such as blade server systems, face challenges in maintaining signal quality due to increased transmission speed and heat generation, and require easier reconfiguration and maintenance, particularly with midplane-type systems where airflow is restricted.
Innovation Solution
The design includes a communication module with a circuit board and a support wall that allows an electrical connector to float within a wall opening, coupled with a flex cable assembly, enabling improved signal transmission and airflow while facilitating easy module reconfiguration and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrical connector is rigidly fixed to the circuit board, then the connection stability is improved, but the signal quality deteriorates due to misalignment during mating
Solution Approach 1:
The electrical connector is designed to be movable relative to the circuit board through a flexible cable assembly, allowing dynamic adjustment during the mating process. The connector can move in the mating direction to accommodate alignment variations and achieve proper engagement, then is constrained by the support wall to maintain stable connection.
Solution Approach 2:
The flexible cable assembly acts as an intermediary element between the circuit board and the electrical connector. It provides the necessary degrees of freedom for alignment while maintaining electrical connection, allowing the connector to float within the support wall opening and adjust its position during mating.
2Ease of operation
If the communication module is directly engaged with the backplane, then the ease of reconfiguration is improved, but the signal quality deteriorates due to longer traces and more interfaces
Solution Approach 1:
The electrical connection path is segmented into multiple components: the electrical connector on the module, the flexible cable assembly, and the board interconnect on the backplane. This segmentation allows each component to be optimized independently and enables easier reconfiguration by allowing module removal and replacement without affecting the entire system.
Solution Approach 2:
The flexible cable assembly uses a flexible printed circuit board or flexible wire to connect the electrical connector to the board interconnect. This flexible connection reduces the overall trace length compared to rigid direct engagement while maintaining signal integrity, and enables easier module reconfiguration.
3Productivity
If the transmission speed is increased, then the productivity is improved, but the heat generation increases and signal quality deteriorates
Solution Approach 1:
The electrical connector and its associated heat generation are extracted from the main circuit board structure and positioned in a dedicated support wall opening. This separation allows for improved airflow and heat dissipation around the connector, reducing the thermal impact on the overall system while maintaining high transmission speeds.
4Device complexity
If the airflow is restricted by the midplane circuit board, then the device complexity is reduced, but the heat management capability deteriorates
Solution Approach 1:
The support wall structure creates localized airflow paths around the electrical connector while maintaining the overall simplicity of the midplane design. The wall opening and flexible cable assembly configuration allow heat to escape from the connector region without requiring complex system-wide airflow management.
Data Source
AI summary
A communication module including a circuit board having leading and trailing ends and a module axis extending therebetween. The communication module also includes a support wall that is coupled to the circuit board proximate to the leading end. The support wall extends transverse to the module axis and has a wall opening. The communication module also includes an electrical connector that is held by the support wall within the wall opening and has a mating face. The communication module also includes a board interconnect coupled to the circuit board. The communication module also includes a flex cable assembly that is coupled at one end to the array of electrical contacts and at an opposite end to the board interconnect. The electrical connector is permitted to float within the wall opening relative to the support wall.