Card Edge Connector Contact Positioning for Resonance Reduction
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Solution Overview
Problem
Card edge connectors experience increased resonance issues during high-speed signal transmission, affecting stability, due to the arrangement of grounding and differential contacts.
Innovation Solution
The design includes an insulative housing with contacts arranged in a specific configuration, featuring differential pairs and grounding contacts, where the differential pairs' contacting portions are closer to the mating face than the grounding contacts, reducing resonance by ensuring proper contact sequencing during signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If grounding contacts and differential contact pairs are arranged in one row, then the connector structure is simple and easy to manufacture, but resonance increases affecting high-speed signal transmission stability
Solution Approach 1:
The contact arrangement is segmented into multiple rows instead of a single row. Differential contact pairs are placed in one row while grounding contacts are positioned in a separate row, physically separating signal paths from ground paths to reduce electromagnetic interference and resonance coupling between adjacent contacts.
Solution Approach 2:
The design transitions from a one-dimensional single-row arrangement to a two-dimensional multi-row configuration. By distributing contacts across multiple rows with different longitudinal positions, the patent creates spatial separation that reduces resonance while maintaining manufacturing feasibility.
2Reliability
If multiple grounding contacts are added to reduce resonance, then signal transmission stability improves, but device complexity increases
Solution Approach 1:
Multiple grounding contacts are merged into a unified row structure that runs parallel to the differential contact pairs. This consolidation approach reduces device complexity by organizing ground contacts systematically rather than scattering them individually, while still providing adequate grounding for resonance reduction.
3Speed
If differential contact pairs are positioned closer to the mating face, then contact sequencing is improved for high-speed signals, but grounding contact effectiveness may be reduced
Solution Approach 1:
Differential contact pairs are positioned to make contact with the mating connector before grounding contacts during the insertion process. This preliminary action ensures that signal paths are established first for high-speed data transmission, while grounding contacts follow to provide reference potential, optimizing both speed and reliability.
Data Source
AI summary
An electrical connector includes an insulative housing having a longitudinal slot and at least one row of contacts retained in the housing. Each of the contacts defines a retention portion, a resilient contacting arm extending from the retention portion with a contacting portion protruding into the longitudinal slot, and a soldering tail extending out of the housing. The contacts include at least two differential pairs adjacent to each other and at least one grounding contact sandwiched therebetween in the longitudinal direction. The contacting portions of each differential pairs are closer to the mating face than the contacting portion of the grounding contact in the mating direction, which can improve resonance of the electrical connector during transferring high-speed signals.