Connection Terminal Width Transition for High-Speed Signal Integrity
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Solution Overview
Problem
Conventional connectors experience impedance mismatch and poor signal integrity due to constant width transitions from the main body to the narrow soldering legs, which is critical for high-speed data transmission applications exceeding 224 Gbps.
Innovation Solution
A connection terminal design featuring a main body and soldering leg with different widths, incorporating a transition section with a gradually changing width to reduce impedance mismatch, and a bent portion to facilitate accurate machining and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the terminal width is kept constant from main body to soldering leg, then the manufacturing is simple, but the impedance mismatch increases and signal integrity deteriorates
Solution Approach 1:
The terminal structure is designed with different width characteristics in different sections: the main body portion maintains a first width for mechanical strength and connection, while the soldering leg portion maintains a second width for proper soldering fitment, and the transition section gradually changes width between these two sections to control impedance. This local differentiation of structural properties resolves the contradiction between manufacturing simplicity and signal integrity.
Solution Approach 2:
The transition section employs a curved or tapered geometry to gradually change the width from the main body to the soldering leg. This curved transition smooths the impedance profile along the signal path, preventing abrupt impedance changes that would cause reflections and signal integrity issues, while still being manufacturable using standard forming processes.
2Ease of manufacture
If the terminal width transitions abruptly from main body to soldering leg, then the manufacturing is easier, but the impedance mismatch increases
Solution Approach 1:
The terminal is designed with distinct local zones: a main body zone with constant width, a soldering leg zone with constant width, and an intermediate transition zone with gradually changing width. This local quality differentiation allows each section to be optimized for its specific function while maintaining overall manufacturability.
Solution Approach 2:
The transition section uses a curved or tapered profile to create a smooth width transition between the main body and soldering leg. This curved geometry provides gradual impedance transformation that is easier to manufacture than complex multi-section structures, while achieving better impedance control than abrupt transitions.
3Ease of operation
If the soldering leg is made narrow for proper fitment, then the connection to circuit board is improved, but the impedance increases and signal integrity worsens
Solution Approach 1:
The transition section employs a curved or tapered geometry that gradually increases the width from the narrow soldering leg to the wider main body. This curved transition extends the impedance transformation over a longer distance, allowing the narrow soldering leg to achieve proper fitment on the circuit board while the gradual width increase maintains impedance matching and signal integrity.
Solution Approach 2:
The terminal is segmented into distinct functional zones: the soldering leg portion optimized for fitment with appropriate narrow width, the transition section for impedance control with gradual width change, and the main body portion for mechanical strength. This segmentation allows each section to be optimized independently for its specific function.
Data Source
AI summary
A connector connection terminal for an electrical connector includes a main body part, a soldering leg and a transition section. The main body part is adapted to be installed inside an insulating housing of the electrical connector. The soldering leg is adapted to be soldered onto a circuit board so as to electrically connect the connection terminal to the circuit board. The soldering leg and the main body part have different widths. The transition section extends from the main body part to the soldering leg such that a width of at least a portion of the transition section is gradually changed.