Shielded I/O Connector Assembly for High-Speed Signal Integrity
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Solution Overview
Problem
Existing I/O connectors are challenging to construct and assemble due to their sensitivity to small dimensional variations and the need for 90° rotation of metal elements, which complicates the connection between a host PCB and a paddle card or module PCB.
Innovation Solution
The design incorporates flexible and rigid shields in the I/O connectors, with flexible shields self-aligning to cover ground conductors and maintain a nominal distance from signal conductors, while rigid shields provide mechanical support and resist flexing, enhancing mechanical strength and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional stacked wafer configuration is used, then electrical connections can be established, but the connector becomes sensitive to small dimensional variations and requires complex 90° rotation assembly
Solution Approach 1:
The patent employs flexible shields that can dynamically adapt to dimensional variations through elastic deformation. The flexible shield includes a body portion and contact portions that can bend and flex to accommodate misalignments between mating connectors, eliminating the need for precise dimensional control while maintaining reliable electrical contact
Solution Approach 2:
The patent uses flexible shields made of elastomeric materials that act as compliant elements between rigid components. These flexible shields absorb dimensional variations and misalignments through their inherent elasticity, replacing the need for precision-machined rigid connections and complex assembly procedures
2Reliability
If flexible shields are added to affect transmission line impedance, then signal integrity improves, but device complexity increases
Solution Approach 1:
The flexible shield serves multiple functions simultaneously: it provides electromagnetic shielding, maintains transmission line impedance through its proximity to signal conductors, ensures electrical contact with ground conductors, and accommodates dimensional variations. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
Solution Approach 2:
The patent modifies the physical parameters of the flexible shield, such as its thickness, material composition, and distance from signal conductors, to achieve the desired transmission line impedance. By adjusting these parameters, the shield affects the electrical characteristics of the transmission line without requiring complex additional structures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration facilitates high data rate transmissions, improves signal integrity, and simplifies the assembly process by providing increased mechanical strength and effective shielding against electromagnetic interference.
Implementation Method 1
each flexible shield may be configured to correspondingly flex in substantially the same direction as the respective ground conductors yet maintain a nominal distance from respective signal conductors
Implementation Method 2
each rigid shield may be configured to resist flexing in substantially the same direction as respective electrical ground conductors of a respective wafer
Implementation Method 3
lengthwise portions of each flexible shield are configured at a nominal distance from cantilever beam sections of electrical signal conductors of a corresponding pair of differential signal conductors of a transmission line for affecting an impedance of the transmission line
Data Source
AI summary
Input/output (I/O) connectors (1) for conducting data at high data rates, (e.g. 112 gigabits per second or more) are provided with protective shields (4, 5, 6) to provide increased mechanical strength and signal integrity.