Grounded Cable Assembly Shielding for 112 Gbps Crosstalk Control
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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, a first connector near the control device, a second connector away from the control device, and a cable assembly with a paddle card substrate and conductive resin cover that electrically connects to ground but not to signal electrodes, thereby reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary 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 occurs and signal transmission reliability deteriorates
Solution Approach 1:
A ground cover is introduced as an intermediary component between signal transmission lines to shield and isolate them. The ground cover is electrically connected to ground potential and positioned to cover the signal lines, acting as a mediator that prevents electromagnetic interference and crosstalk between adjacent signals, thereby maintaining transmission reliability over longer distances
Solution Approach 2:
The ground cover is implemented as a thin conductive film or shell structure that is electrically connected to ground. This thin film structure provides effective electromagnetic shielding while occupying minimal space, allowing the apparatuses to be positioned at greater distances without compromising signal integrity
2Productivity
If the transmission rate is increased to 112 Gbps or more, then the data transmission capability is improved, but crosstalk prevention becomes insufficient and signal quality deteriorates
Solution Approach 1:
The ground cover serves as a protective intermediary that shields high-speed signal lines from electromagnetic interference. By providing a continuous ground plane that covers the signal transmission path, it creates an isolated electromagnetic environment that prevents crosstalk, enabling reliable transmission at 112 Gbps and higher rates
Solution Approach 2:
The invention modifies the electromagnetic environment parameters by introducing a ground cover that changes the impedance characteristics and shielding effectiveness of the transmission line. This parameter change creates a controlled electromagnetic environment suitable for high-speed signal transmission, reducing crosstalk and maintaining signal quality at 112 Gbps
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 minimizes crosstalk, ensuring good electrical characteristics and secure high-speed signal transmission up to 112 Gbps even at larger distances, as demonstrated by reduced NEXT and FEXT characteristics.
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 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.