Paddle Card Ground Plane Segmentation for USB-C Signal Integrity
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Solution Overview
Problem
USB Type-C connectors face challenges in maintaining high-speed signal effectiveness due to the reversible feature, which complicates circuit board and cable soldering, leading to issues with impedance matching and crosstalk between differential signal pairs.
Innovation Solution
A paddle card with a circuit board and ground planes is designed to connect cables and plugs, featuring differential pads and strategically placed openings in ground planes for impedance matching and crosstalk prevention, ensuring effective high-speed signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ground planes are continuously solid between differential pads, then shielding effect is improved, but crosstalk between adjacent differential pairs increases
Solution Approach 1:
The ground plane is segmented by introducing openings (via holes or recesses) at specific locations between differential pads. This segmentation breaks the continuous ground plane into isolated regions, allowing each differential pair to have its own dedicated ground region, thereby preventing electromagnetic coupling between adjacent pairs while maintaining shielding within each pair.
Solution Approach 2:
The ground plane structure is made non-uniform by placing openings only at specific locations (between differential pads) while keeping other areas solid. This local modification optimizes the shielding-crosstalk tradeoff by providing shielding where needed (under differential pads) while preventing crosstalk where not needed (between differential pairs).
2Manufacturing precision
If openings are added to ground planes for impedance matching, then signal integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The openings in the ground plane are combined with the via hole structure to form an integrated through-hole feature. This merging allows the opening to be created during the standard via formation process, eliminating the need for separate opening creation steps and reducing manufacturing complexity while still achieving the impedance matching function.
Data Source
AI summary
A paddle card includes a circuit board, a pad group and ground planes. The circuit board has an upper surface and a lower surface opposite to each other. The pad group is adapted to connect wires of a cable or terminals of a plug, and includes a pair of upper differential pads on the upper surface and a pair of lower differential pads on the lower surface. The pair of upper differential pads and the pair of lower differential pads are corresponding to each other respectively and configured up and down. The ground planes are spaced at intervals between the upper surface and the lower surface. The ground plane below the pair of upper differential pads has an opening corresponding thereto. A portion of the at least one ground plane between the pair of upper differential pads and the pair of lower differential pads is solid as a shield.