Differential Transmission Board Layout for Stable Connector Impedance
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Solution Overview
Problem
Existing differential transmission boards face challenges in improving transmission characteristics due to capacitive coupling and differential impedance issues, particularly when connected through compression connectors.
Innovation Solution
A differential transmission board set is developed with two multilayer boards connected via a compression connector, featuring specific electrode pad arrangements and penetrating holes in the conductor layers to minimize capacitive coupling and optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the penetrating hole is positioned to overlap the outer region of ground pads in the contact board, then capacitive coupling between signal pads and ground layer is reduced, but the structural complexity of the board design increases
Solution Approach 1:
The patent applies local quality by creating distinct inner and outer regions in ground pads with different functions. The inner region maintains close proximity to signal pads for electromagnetic shielding, while the outer region is positioned away from signal pads to reduce capacitive coupling. This spatial differentiation allows each region to optimize its local electrical characteristics for its specific function.
Solution Approach 2:
The patent resolves the contradiction by transitioning from a two-dimensional planar arrangement to a three-dimensional layered structure. The penetrating hole passes through multiple conductor layers at different heights, allowing it to overlap ground pad outer regions in the contact board while maintaining separation from signal pads through vertical positioning in the laminating direction.
2Reliability
If the electrode pads are arranged in a specific sequence along the first direction, then transmission characteristics are optimized, but the area occupied by the connector increases
Solution Approach 1:
The patent merges the functions of multiple electrode pads into a compact linear arrangement along the first direction. By organizing the four electrode pads (first ground pad, first signal pad, second signal pad, second ground pad) in a sequential linear pattern rather than a distributed two-dimensional layout, the design achieves optimized transmission characteristics through controlled impedance while minimizing the overall area occupied by the connector.
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
The solution enhances transmission characteristics by reducing differential impedance and insertion loss, while maintaining a stable differential impedance, thus improving signal integrity and transmission efficiency.
Implementation Method 1
a compression connector including four compression contacts arranged in a row, each compression contact including a soldering part and a spring part
Implementation Method 2
the soldering parts of the four compression contacts are able to be soldered to the first ground pad, the first signal pad, the second signal pad, and the second ground pad
Implementation Method 3
this reduces capacitive coupling between the two cable connection pads 1003 and the second conductor layer 1000B, and thereby controls a decrease in differential impedance
Data Source
AI summary
A differential transmission board set includes a mounting board on which a compression connector is mounted and a contact board configured to come into contact with the compression connector. In the contact board, a second conductor layer is a ground layer and has a penetrating hole. The penetrating hole is formed in such a way that a first signal pad and a second signal pad are both located inside an inner edge of the penetrating hole. In the contact board, the penetrating hole is formed to overlap an outer region of the first ground pad and an outer region of the second ground pad. In the mounting board, the penetrating hole is formed to be away from the first ground pad and the second ground pad when viewed along the vertical direction.