Connector Impedance Matching via Localized Trace Geometry
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Solution Overview
Problem
As electronic devices become thinner and smaller, maintaining desired impedance characteristics in connector systems becomes challenging, leading to variations and distortions in signal paths that affect data transfer rates.
Innovation Solution
The development of connector inserts and receptacles with specific structural features such as spring finger contacts, varying trace distances from ground planes, and dielectric modifications to maintain consistent impedance, including the use of distributed element filters to reduce common-mode energy and compensate for impedance errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If connector components are made thinner to reduce device thickness, then device size is reduced, but impedance control becomes more difficult
Solution Approach 1:
The patent applies local quality by varying the trace width and spacing at different locations along the connector signal path. Specifically, the trace width is adjusted in different sections (e.g., wider near the contact, narrower further away) to compensate for local impedance variations caused by the thin geometry and proximity to ground planes. This localized adjustment of geometric parameters maintains consistent impedance throughout the signal path despite the overall reduced thickness.
Solution Approach 2:
The patent employs parameter changes by modifying key geometric parameters of the transmission line structure, including trace width, trace spacing, and distance to ground plane, to achieve desired impedance characteristics. By systematically varying these parameters along the signal path, the design compensates for the challenges posed by reduced component thickness and maintains controlled impedance in the thinner connector geometry.
2Manufacturing precision
If trace distance to ground plane is reduced to minimize impedance, then impedance control improves, but capacitance increases causing impedance decrease
Solution Approach 1:
The patent applies local quality by creating non-uniform trace-to-ground spacing along the signal path. Instead of maintaining a constant distance, the design varies the spacing locally - with closer spacing in some regions and farther spacing in others - to balance the capacitance effects and achieve overall impedance matching. This localized variation compensates for the increased capacitance while maintaining signal integrity.
Solution Approach 2:
The patent employs asymmetry by intentionally creating unequal trace-to-ground plane distances at different positions along the connector. The asymmetric geometry is designed to counterbalance the capacitive effects, where closer spacing compensates for inductive effects and farther spacing compensates for capacitive effects, ultimately achieving consistent impedance despite the asymmetric appearance.
3Length of stationary object
If connector height is reduced for thinner devices, then device thickness decreases, but impedance variations increase
Solution Approach 1:
The patent employs parameter changes by systematically adjusting multiple geometric parameters including trace width, trace spacing, and vertical positioning relative to ground planes to achieve desired impedance characteristics in the reduced-height connector. By coordinating changes across these parameters, the design maintains impedance control despite the overall height reduction.
Solution Approach 2:
The patent applies dimensionality change by utilizing variations in the horizontal plane (trace width and spacing) to compensate for constraints in the vertical dimension (reduced height). By shifting the impedance control strategy from primarily vertical spacing to horizontal dimension adjustments, the design achieves impedance matching in the constrained thin-profile connector.
Data Source
AI summary
Connector inserts and receptacles that provide signal paths having desired impedance characteristics. One example may provide a connector system having a connector insert and a connector receptacle. Contacts in the connector insert may form signal paths with corresponding contacts in the connector receptacle. Additional traces in the connector insert and receptacle may be part of these signal paths. The signal paths may have a target or a desired impedance along their lengths such that the power paths electrically appear as transmission lines. Constraints on physical dimensions of the connector insert and connector receptacle contacts may result in variations in impedance along the signal paths. Accordingly, embodiments of the present invention may provide structures to reduce these variations, to compensate for these variations, or a combination thereof.