Cable Assembly Shielding Layout for 112 Gbps Crosstalk Reduction
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Solution Overview
Problem
Existing technologies face challenges in preventing crosstalk during high-speed signal transmission between apparatuses separated by distances greater than 25 cm, particularly at transmission rates of 112 Gbps or more.
Innovation Solution
A high-speed transmission device comprising a substrate with a control device, first and second connectors, and a cable assembly that includes a paddle card substrate with electrodes for signal and ground, and a conductive resin cover that is electrically connected only to ground, not signal, to prevent crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between apparatuses is increased beyond 25 cm for high-speed signal transmission, then the spatial arrangement flexibility is improved, but crosstalk between signals increases significantly
Solution Approach 1:
A conductive resin cover is introduced as an intermediary shielding element between signal transmission lines. This conductive cover acts as a mediator that blocks electromagnetic interference between adjacent signals, preventing crosstalk while allowing the apparatuses to be positioned at greater distances apart on the substrate.
Solution Approach 2:
The harmful electromagnetic field causing crosstalk is extracted and redirected to ground through the conductive resin cover. By providing a dedicated path to ground, the interfering energy is removed from the signal environment, enabling longer transmission distances without crosstalk degradation.
2Reliability
If a conductive cover is added to prevent crosstalk, then signal transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent changes the material parameter of the connector by incorporating conductive resin instead of traditional insulating materials. This parameter change enables the connector to provide both mechanical support and electromagnetic shielding functions, improving signal reliability without requiring additional separate shielding components.
Solution Approach 2:
The conductive resin cover merges multiple functions into a single component: it serves as both the connector housing and the electromagnetic shield. By combining the structural support function with the crosstalk prevention function, the device complexity is minimized while achieving reliable high-speed signal transmission.
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
The solution effectively reduces crosstalk by 5 to 10 dB across various frequency bands, ensuring reliable high-speed signal transmission up to 60 GHz.
Implementation Method 1
a first conductive resin cover (43) covering the paddle card substrate (41), the internal conductors (21) of the cables (2), and connection portions of the external conductors (23) of the cables (2). The first conductive resin cover (43) is not electrically connected to the first electrodes (4) for signal, but is electrically connected to the first electrodes (5) for ground
Data Source
AI summary
According to an embodiment, a high-speed transmission device includes a substrate, a control device on the substrate, a first connector, a second connector; and a cable assembly between the first connector and the second connector. The first connector is disposed at a position near the control device on the substrate and electrically connected to the control device via the substrate. The second connector is disposed at a position away from the control device on the substrate and equipped with an apparatus for transmitting/receiving a signal to and from the control device. The cable assembly includes a cable row, a paddle card substrate and a first conductive resin cover. Cables each transmitting a differential signal are arranged side by side in the cable row. The cables each comprise an internal conductor and an external conductor.