PCB Low-Loss Material Layer for High-Speed Signal Integrity
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Solution Overview
Problem
As display devices increase in size and resolution, the number of wires on the panel and circuit elements on the printed circuit board (PCB) also increases, leading to significant frequency loss and higher manufacturing costs due to the need for more circuit elements and wires to control these high-speed signals.
Innovation Solution
Incorporating low-loss material layers adjacent to high-speed signal wire layers on the PCB, with these layers being 15% to 100% of the thickness of the adjacent insulation layers, made from materials like hydrocarbon, ceramic, thermosetting polyester, high-performance FR4, or polytetrafluoroethylene (PTFE), to minimize frequency-dependent loss and signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-loss material layers are added adjacent to high-speed signal wire layers, then frequency loss is reduced and signal quality is improved, but manufacturing cost increases due to the expensive nature of low-loss materials
Solution Approach 1:
The patent applies low-loss material layers only in specific locations adjacent to high-speed signal wire layers, rather than uniformly across the entire PCB. This localized application provides signal quality improvement where needed while minimizing the amount of expensive low-loss material used, thereby reducing overall manufacturing cost.
Solution Approach 2:
The PCB structure is segmented into different material zones: low-loss material layers are placed only where high-speed signals require protection from frequency loss, while other areas use conventional, less expensive materials. This segmentation allows optimization of signal quality in critical areas without unnecessarily increasing cost across the entire board.
2Loss of energy
If the thickness of low-loss material layer is increased, then frequency loss is further reduced, but manufacturing cost and material usage increase
Solution Approach 1:
The patent applies low-loss material layers with a thickness optimized to provide sufficient protection against frequency loss, rather than using excessive thickness. The low-loss material layer thickness is set to about 15% to 85% of the adjacent insulation layer thickness, which is enough to achieve the desired frequency loss reduction without unnecessarily increasing material consumption and cost.
Data Source
AI summary
A printed circuit board includes an insulation layer adjacent to a high-speed signal wire layer. A low-loss material layer is provided between the high-speed signal wire layer and the insulation layer. As a result, it is possible to reduce frequency loss of a high-speed signal wire layer and improve reliability of the printed circuit board.