PCB Bridging Unit for Signal Crosstalk Reduction
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Solution Overview
Problem
Conventional printed circuit boards face challenges in reducing signal crosstalk at high operating speeds, particularly due to electromagnetic interference, without increasing the circuit board size or area, which affects signal transmission quality.
Innovation Solution
A printed circuit board assembly with a first bridging unit that forms conductive ground paths over signal traces without contacting them, using conductive elements connected to ground traces and regions, effectively shielding signals and improving transmission speed without enlarging the board's area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board size is increased to provide more layout area for arranging signal traces and ground traces, then the signal transmission quality can be improved, but the area of the circuit board increases
Solution Approach 1:
The patent introduces a third dimension by placing bridging units above the wiring layer to form conductive ground paths. Instead of expanding the circuit board area in the horizontal plane, the solution vertically stacks conductive elements (ground traces, bridging units, and ground regions) to create additional shielding layers, effectively using dimensional transition to improve signal transmission quality without increasing board area.
2Reliability
If a four-layered circuit board is used to reduce crosstalk, then the signal transmission quality can be improved, but the fabrication cost increases
Solution Approach 1:
The patent segments the shielding function into discrete components: ground traces in the wiring layer, bridging units positioned above specific signal traces, and ground regions. This segmented approach provides targeted shielding only where needed rather than requiring a complete four-layered structure, thereby reducing fabrication cost while maintaining signal transmission quality.
Solution Approach 2:
The bridging units act as intermediary elements that connect ground traces to ground regions, forming conductive ground paths that provide shielding without requiring a full four-layered board structure. These intermediary components enable selective shielding at critical points, reducing the need for expensive multi-layer fabrication while maintaining signal integrity.
3Productivity
If the operating speed of the packaged integrated circuit component is increased, then the productivity can be improved, but the crosstalk between adjacent signal traces becomes more severe
Solution Approach 1:
The patent implements preliminary anti-action by pre-establishing conductive ground paths using bridging units positioned above signal traces before signals are transmitted. These pre-configured shielding structures proactively counteract electromagnetic interference and crosstalk that would otherwise occur at high transmission speeds, enabling faster operation without signal degradation.
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 effectively shields signal traces, enhancing signal transmission speed and quality, allowing for higher operating speeds without increasing the circuit board's size or area, comparable to four-layered boards but at a lower cost.
Implementation Method 1
The first bridging unit extends over, without contacting, at least one of the first signal traces from one of the first ground traces to another one of the first ground traces or the first ground region so as to form at least one first conductive ground path
Data Source
AI summary
A printed circuit board assembly and an electronic apparatus using the same are provided. The printed circuit board assembly includes a circuit board and a first bridging unit. The circuit board includes a first wiring layer, and the first wiring layer includes a plurality of first ground traces, a plurality of first signal traces, and at least one first ground region. Each of the first signal traces is disposed between one of the first ground traces and the first ground region. The first bridging unit is disposed on the first wiring layer of the circuit board. The first bridging unit extends over, without contacting, at least one of the first signal traces from one of the first ground traces to another one of the first ground traces or the first ground region, so as to form at least one first conductive ground path.