Cable Assembly Butt Weld Termination for High-Speed Signal Integrity
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Solution Overview
Problem
High-speed differential connectors face signal loss and degradation due to impedance issues at the transition between cable shields and contacts, as well as changes in dielectric material and shape, leading to increased cross-talk and return loss.
Innovation Solution
The design includes a cable assembly with a cable core having exposed segments of signal conductors terminated via butt welds to signal contacts, surrounded by a cable shield and a ground shield for improved impedance control and shielding, reducing interference and maintaining signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding components are terminated to the cable shield, then interference between contacts is reduced, but the transition between shield and cable shield negatively affects signal integrity and impedance
Solution Approach 1:
A transition plate is introduced as an intermediary component between the cable shield and the ground shield. This transition plate provides a gradual impedance transition, mediating the connection between the cable shield and the ground shield to maintain signal integrity while still providing shielding effectiveness.
Solution Approach 2:
The transition plate is designed with varying dimensions and material properties to create a gradual impedance transition. By changing the physical parameters (size, shape, material composition) of the transition plate, the impedance profile is optimized to minimize signal reflection and maintain signal integrity during the transition from cable shield to ground shield.
2Reliability
If signal conductors are terminated to contacts, then electrical connection is established, but overlap between signal conductor and signal contact creates impedance drop
Solution Approach 1:
The contact holder is designed with specific geometric parameters and material properties to maintain controlled impedance throughout the connection. By optimizing the dimensions, shape, and material of the contact holder, the impedance profile is maintained consistent during the transition from signal conductor to signal contact, minimizing impedance drops.
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 enhances signal integrity by minimizing impedance drops and cross-talk, ensuring reliable high-speed signal transmission through improved cable termination and shielding.
Implementation Method 1
The cable has a cable shield surrounding the cable core providing electrical shielding along a length of the cable
Implementation Method 2
The ground shield is electrically connected to the cable shield
Implementation Method 3
The terminating end has a first weld edge welded to the first conductor end at a first butt weld
Data Source
AI summary
A cable assembly is provided and includes a cable core including a first signal conductor and a second signal conductor separated by at least one insulator. The first and second signal conductor both include exposed segments extending forward from their respective insulator to a conductor end. The cable assembly includes a contact holder extending between a front and a rear. The cable assembly includes a first contact received in the corresponding channel of the contact holder. The first contact has a mating end and a terminating end. The cable assembly includes a first contact and a second contact received in their corresponding channel of the contact holder. The first and second contact have a mating end and a terminating end. The terminating end has a weld edge welded to the conductor end at a butt weld.