Flexible Transmission Line Layout for Power Noise Isolation
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Solution Overview
Problem
In existing multilayer resin flexible cables, noise from the power supply line often propagates to the high-frequency signal transmission line, leading to faults and degradation of transmission characteristics.
Innovation Solution
The power supply line and high-frequency signal transmission line are positioned in parallel with a differential signal transmission line between them, effectively spacing them apart to reduce noise propagation, and the differential signal transmission line is designed with higher noise resistance to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power supply line and high-frequency signal transmission line are arranged adjacently to simplify the structure, then the device complexity is reduced, but noise from the power supply line propagates to the high-frequency signal transmission line degrading transmission quality
Solution Approach 1:
A differential signal transmission line is introduced as an intermediary element positioned between the power supply line and the high-frequency signal transmission line. This intermediary structure acts as a barrier to noise propagation while maintaining the compact overall structure of the transmission line assembly.
Solution Approach 2:
The transmission line utilizes a multilayer substrate structure where different signal lines are arranged in different layers and orientations. The differential signal transmission line is positioned in a intermediate layer between the power supply line and high-frequency signal line, creating spatial separation in the vertical dimension while maintaining planar integration.
2Object-affected harmful factors
If the power supply line and high-frequency signal transmission line are spaced apart to reduce noise propagation, then transmission quality is improved, but the transmission line increases in width occupying more space
Solution Approach 1:
The solution transitions from horizontal spacing to vertical layering by utilizing the substrate's thickness dimension. The differential signal transmission line is positioned in an intermediate layer, achieving noise isolation through vertical separation rather than horizontal distancing, thereby maintaining a compact transmission line width.
Solution Approach 2:
The differential signal transmission line is nested within the overall transmission line structure, positioned between the power supply line and high-frequency signal line. This nested arrangement achieves noise shielding while optimizing the use of available space within the transmission line cross-section.
Data Source
AI summary
A transmission line includes a substrate, a high-frequency signal transmission line, a differential signal transmission line, and a power supply line. The substrate is insulating, extends in a predetermined direction, and internally includes each of the high-frequency signal transmission line, the differential signal transmission line, and the power supply line. The power supply line and the high-frequency signal transmission line are in parallel or substantially in parallel to each other, and the differential signal transmission line is between the power supply line and the high-frequency signal transmission line.