Card Edge Connector Ground Potential Equalization
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Solution Overview
Problem
High-speed signal transmission in card edge connectors leads to increased crosstalk due to differing electric potentials between ground contacts and signal line contacts, which degrade shielding effects and increase noise.
Innovation Solution
The card edge connector arranges signal line contacts and ground contacts in a G-S-S-G layout with common contacts electrically connecting all ground contacts to maintain a uniform electric potential, reducing crosstalk and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ground contacts are arranged in a G-S-S-G layout for crosstalk suppression, then shielding effect is improved, but electric potential difference between ground contacts increases causing increased crosstalk at high frequencies
Solution Approach 1:
The patent applies the equipotentiality principle by providing a common ground connection that electrically connects all ground contacts to the ground common plane at the same electric potential. This eliminates the potential difference that occurs when ground contacts are connected through multiple paths, thereby maintaining effective shielding against high-frequency signals and reducing crosstalk between adjacent signal line contacts.
2Speed
If multiple ground contacts are used for high-speed signal transmission, then signal transmission capability is improved, but electric potential difference between ground contacts increases degrading shielding
Solution Approach 1:
The common ground connection ensures that all ground contacts operate at the same electric potential, enabling high-speed signal transmission without the crosstalk degradation that would otherwise result from potential differences between multiple ground contacts.
3Adaptability or versatility
If ground contacts are connected through multiple paths in the printed wiring board, then connectivity is improved, but electric potential uniformity deteriorates increasing noise
Solution Approach 1:
The patent introduces a common ground connection that provides a direct electrical path from all ground contacts to the ground common plane, ensuring uniform electric potential across all ground contacts. This eliminates noise generated by potential differences while maintaining the connectivity benefits of multiple ground contact paths.
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 shielding effectiveness, reduces crosstalk between signal line contacts, and suppresses noise emissions by ensuring all ground contacts are at the same electric potential, improving high-speed signal transmission.
Implementation Method 1
all of the multiple ground contacts arranged in the one row are electrically connected to one another by use of a common contact
Data Source
AI summary
The present invention provides a card edge connector as a high-speed differential signal connector configured to equalize electric potentials of ground contacts adjacent to signal line contacts, and thus to reduce crosstalk between adjacent signal line contacts. The card edge connector serves as a female connector in which multiple signal line contacts and multiple ground contacts are arranged in parallel in at least one row. In the card edge connector, the signal line contacts and the ground contacts are arranged in a way that every two signal line contacts for high-speed signals to send and return respectively therethrough are interposed between two ground contacts, and all of the multiple ground contacts arranged in the one row are electrically connected to one another by use of a common contact.