Cable Connector Ground Structure for 224 Gbps Signal Integrity
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Solution Overview
Problem
Existing cable connectors struggle to maintain high signal integrity at frequencies above 56 Gbps, particularly in supporting data rates beyond 212 Gbps, due to variations in the relative position of ground structures and cable shields.
Innovation Solution
The implementation of upper and lower ground members within the cable connector, which provide stable and controlled ground paths, along with cable termination assemblies that ensure reliable signal and ground energy paths, helps maintain high signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cable connectors are used, then device interconnection is enabled, but signal integrity deteriorates at frequencies above 56 Gbps due to position variations of ground structures
Solution Approach 1:
The ground connection system is segmented into multiple independent ground members (upper ground member and lower ground member) that can be independently positioned and connected. This segmentation allows each ground member to be optimized for specific functions: the lower ground member provides stable mechanical positioning while the upper ground member ensures reliable electrical connection, thereby reducing overall position variation impact on signal integrity
Solution Approach 2:
The invention transitions from a planar ground connection structure to a three-dimensional configuration with upper and lower ground members positioned at different heights. This dimensional change allows the ground structures to accommodate position variations in multiple spatial directions, providing stability against both vertical and lateral displacements of the cable shield, thus improving signal integrity at high frequencies
2Reliability
If ground structures are made more rigid to reduce position variation, then signal integrity improves, but device complexity increases
Solution Approach 1:
The upper ground member and lower ground member are merged into a unified ground connection system that works together to provide both mechanical stability and electrical connection. This merged structure achieves improved signal integrity through coordinated action of multiple ground members rather than requiring a single overly complex rigid structure, thus balancing reliability improvement with manageable device complexity
Solution Approach 2:
The invention creates equipotential ground paths through multiple ground members that are electrically connected, ensuring uniform potential distribution across the ground structure. This equipotential design reduces signal integrity issues caused by position variations without requiring excessive structural rigidity, thereby improving reliability while controlling device complexity
Data Source
AI summary
A high frequency cable assembly with a plug connector terminating shielded cables via cable termination assemblies mounted to a paddle card. Cable termination assemblies provide paths for ground current between the cable shield and paddle card providing low insertion and return loss and crosstalk at frequencies up to at least 53 GHz, which supports data rates of 224 Gbps and above. Disclosed features of the cable termination assemblies may be used alone or in combination and include: termination of a row of cables, structures configured based on angle of arrival of cables to the cable termination assembly, ground members that align with individual cables, and upper and lower ground members coupled to the cable shield and ground structures of the paddle card that at least partially encircle signal paths outside the cable shields. The upper and lower ground members provide ground current paths paralleling those signal paths with substantially uniform spacing.