Cable Card Assembly With Ground Bus for Stable Signal Shielding
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Solution Overview
Problem
Existing electrical connectors face issues with signal integrity and electrical performance due to exposure of signal conductors at the interface with circuit cards, leading to inconsistent ground field consistency and potential failure points in the termination process.
Innovation Solution
A cable card assembly that includes a cable yoke holding cables in fixed positions and a ground bus electrically connected to the circuit card's ground plane, providing consistent shielding and stable grounding for the signal conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If individual pair stripping, termination, drain wire routing, and soldering are performed as in current designs, then the cables can be connected to the circuit card, but signal integrity and ground field consistency deteriorate due to variations in assembly processes and placement
Solution Approach 1:
The patent merges multiple separate assembly operations (stripping, termination, drain wire routing, soldering) into a single integrated cable assembly unit that is pre-assembled with consistent positioning and grounding. This cable assembly includes the cable, shield, drain wire, and circuit card termination all integrated together, eliminating variations from sequential individual operations and ensuring consistent signal integrity and ground field across all differential pairs.
2Ease of operation
If the exposed portions of signal conductors are mechanically and electrically coupled to the circuit card, then electrical connection is achieved, but signal integrity deteriorates due to exposure to air at the interface
Solution Approach 1:
The patent introduces a shield structure as an intermediary element that extends from the cable shield through the circuit card to the ground plane. This shield acts as a mediator that provides continuous electromagnetic shielding and maintains consistent ground potential at the interface between the cable and circuit card, preventing air exposure from degrading signal integrity while still achieving reliable electrical connection.
3Object-affected harmful factors
If a shield is provided around the exposed conductors and termination, then electromagnetic shielding is improved, but ground field consistency deteriorates due to lack of consistency between differential pairs and shield element perimeter
Solution Approach 1:
The patent implements equipotentiality by extending the shield structure continuously from the cable shield through the circuit card to the ground plane, ensuring that the shield and ground elements maintain consistent ground potential across all differential pairs. This continuous shield structure eliminates potential differences between the shield perimeter and differential pairs, achieving both electromagnetic shielding and ground field consistency simultaneously.
4Ease of manufacture
If soldering is used to connect the cable shield and drain wires to the shield element, then electrical connection is achieved, but reliability deteriorates due to difficulty and potential for unreliable ground path
Solution Approach 1:
The patent extracts the soldering operation from the cable assembly process and replaces it with a more reliable mechanical and electrical connection method. The cable assembly is designed with integrated connection features that provide both mechanical support and electrical connectivity without requiring soldering, thereby eliminating the reliability issues associated with difficult soldering operations and potential for unreliable ground paths.
Data Source
AI summary
A cable card assembly includes cables terminated to a circuit card and a cable yoke that holds the cables in fixed positions relative to each other. The cable yoke includes cable troughs at spaced apart positions receiving the corresponding cables. The cable yoke is electrically connected to the cable shields of the cables. The cable card assembly includes a ground bus coupled to the ground plane of the circuit card. The ground bus has cable pockets receiving the cable yoke and the corresponding cables. The cable yoke positions the cables in the cable pockets relative to the ground bus. The ground bus is electrically connected to the cable yoke to electrically connect the cable shields of the cables to the ground plane of the circuit card.