Offset Electrical Connector Contacts for Crosstalk Cancellation
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Solution Overview
Problem
High-speed electrical connectors experience significant row-to-row crosstalk noise due to insufficient grounding of ground contacts, which interferes with signal transmission, especially in thin substrates and high-speed bit rate applications.
Innovation Solution
The electrical connector design features two rows of contacts aligned offset relative to each other, with ground contacts positioned to avoid vertical intersection, creating a zero-sum noise scheme by being equidistant from differential signal contacts, thereby canceling row-to-row crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ground contacts are designed as elongated pins to meet mechanical integrity requirements, then mechanical strength is improved, but grounding sufficiency deteriorates and susceptibility to signal-to-ground noise coupling increases
Solution Approach 1:
The ground contact is divided into multiple grounding points along its length, with first grounding points near signal contacts and second grounding points at intermediate positions. This segmentation provides sufficient grounding at multiple locations without compromising mechanical integrity, resolving the contradiction between strength and grounding effectiveness.
2Ease of manufacture
If ground contacts are positioned directly opposite signal contacts, then mechanical alignment is simplified, but row-to-row crosstalk noise increases due to insufficient grounding distribution
Solution Approach 1:
Ground contacts are positioned with specific local quality requirements: first grounding points are located near signal contacts for local noise suppression, while second grounding points are positioned at intermediate locations for distributed grounding. This localized grounding strategy reduces crosstalk while maintaining alignment feasibility.
3Volume of moving object
If substrates are made very thin to reduce device thickness, then device compactness is improved, but crosstalk noise propagation increases significantly
Solution Approach 1:
Multiple intermediate grounding points are introduced as mediator elements between signal contacts and reference planes. These intermediate grounds act as noise sinks that intercept and dissipate crosstalk noise before it can propagate across thin substrates, enabling compact device design without sacrificing signal integrity.
4Productivity
If high-speed bit rate transmission is implemented to increase data throughput, then productivity is improved, but crosstalk noise interference becomes more severe
Solution Approach 1:
Multiple grounding points are预先 positioned along ground contacts to create preliminary noise sinks before high-speed signals can generate significant crosstalk. This preliminary grounding arrangement proactively suppresses noise generation and propagation, enabling high-speed data transmission without severe crosstalk interference.
Data Source
AI summary
Electrical connector technology is disclosed. In one example, a connector for coupling an electronics sub-assembly to an electronics assembly comprises a connector body having and a sub-assembly interface configured to electrically couple to an electronics sub-assembly. The connector has a circuit board interface configured to electrically couple to a circuit board of an electronics assembly. The connector has at least two rows of contacts configured to electrically couple the circuit board to the electronics sub-assembly. The at least two rows of contacts are aligned offset relative to each other such that any ground contact of one row avoids intersection of a plane in which any ground contact of the other row resides to at least partially cancel row-to-row crosstalk when the at least two rows of contacts are transmitting signals at a predetermined high-speed bit rate.