High-Speed Connector Shielding for 112 Gbps Signal Integrity
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Solution Overview
Problem
Current electrical connectors face challenges in handling high-speed, high-density data transmission due to electrical interference and resonance issues, which affect signal integrity and frequency range, especially at frequencies above 112 Gbps.
Innovation Solution
The design incorporates conductive shielding with lossy material at strategic locations, compressible mounting interface shielding, and two-sided shielding throughout the signal path to reduce cross-talk and resonance, while using a dual insert-molded leadframe assembly (IMLA) with core members formed by a two-shot process to enhance mechanical robustness and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical conductors are placed close to each other to increase density, then the connector can handle more data, but electrical interference and crosstalk between adjacent signal conductors increase
Solution Approach 1:
Ground conductors are introduced as intermediary elements between adjacent signal conductors. These ground conductors act as mediators that intercept and redirect electrical interference, preventing crosstalk between signal paths. The ground conductors are strategically positioned to form electromagnetic shields that protect signal integrity while allowing high-density conductor arrangement.
Solution Approach 2:
The conductor arrangement is segmented into alternating patterns of signal conductors and ground conductors. This segmentation creates distinct electromagnetic zones where signal conductors are isolated from each other by ground conductors, reducing mutual interference. The segmented structure allows high density while maintaining signal integrity through spatial separation of interfering elements.
2Object-affected harmful factors
If shield members are placed between signal conductors to reduce interference, then crosstalk is reduced, but the impedance of conductors is impacted and device complexity increases
Solution Approach 1:
The ground conductors serve dual functions: they act as shields between signal conductors to reduce crosstalk, and they are electrically connected to form a continuous ground plane that provides impedance reference. By merging the shielding function with the ground reference function, the design reduces complexity compared to separate shield members that would require additional mounting and connection structures.
Solution Approach 2:
The ground conductors perform multiple functions simultaneously: electromagnetic shielding, impedance reference, and signal return path. This multi-functionality eliminates the need for separate dedicated shield members, reducing overall device complexity while maintaining effective crosstalk reduction.
3Productivity
If the number of circuits and operating frequencies are increased to handle more data, then data transmission capability is improved, but signal integrity and frequency range are affected by resonance issues
Solution Approach 1:
Ground conductors are positioned as intermediaries between signal conductors to suppress resonant effects. These ground conductors act as electromagnetic barriers that dampen resonance build-up in high-frequency signals, preventing signal integrity degradation. The ground conductors provide a controlled impedance environment that stabilizes high-frequency operation.
4Volume of moving object
If conductors are arranged in high density to reduce connector size, then connector compactness is improved, but electrical interference between adjacent conductors increases
Solution Approach 1:
The high-density conductor array is segmented into columns and rows with ground conductors interspersed between signal conductors. This segmentation creates a grid-like structure where ground conductors form electromagnetic cages around signal conductors, providing shielding in both horizontal and vertical directions. The segmented arrangement achieves high density while maintaining signal isolation through systematic placement of ground elements.
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 approach effectively isolates signal conductors, reduces crosstalk, and increases the frequency range of the connector, supporting data rates above 112 Gbps with improved signal integrity and reduced parasitic capacitance.
Implementation Method 1
The leadframe assembly is attached to a first side of the core member such that the conductive elements configured as ground conductors are coupled to each other through the lossy material
Implementation Method 2
compressible mounting interface shielding
Data Source
AI summary
Electrical connectors for very high speed signals, including signals at or above 112 Gbps. Effectiveness of shielding along the signal paths through the mating electrical connectors may be enhanced through the use of one or more techniques, including enabling two-sided shielding, connections between shield members and between shield members and grounded structures of printed circuit boards to which the connectors are mounted, and selective positioning of lossy material. Such techniques may be simply and reliably implemented in high density connector using one or more techniques. An electrical connector may include core members held by a housing together with leadframe assemblies attached to the core members. The core members may include features that would be difficult to mold in a housing and may include both shields and lossy materials in locations that would be difficult to incorporate in a leadframe assembly.