Reference Plane Segmentation for Signal Crosstalk Reduction
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Solution Overview
Problem
Conventional signal transmission circuits experience increased cross-talk and degraded performance due to electromagnetic wave noise between neighboring signal transmission lines, especially when higher-frequency signals are transmitted, as a result of the lack of effective separation between signal and reference transmission planes.
Innovation Solution
Incorporating separation slots in the reference transmission plane, which are electrically separated from signal transmission lines by insulating layers, to reduce cross-talk by acting as an electromagnetic wave noise reduction area and partially separating the paths of return currents between adjacent signal transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional reference transmission plane structure is used without separation slots, then the structure is simple and continuous, but cross-talk and electromagnetic wave noise interference increase between neighboring signal transmission lines
Solution Approach 1:
The reference transmission plane is segmented by introducing separation slots that divide it into multiple isolated reference transmission regions. These slots physically interrupt the continuous reference plane, creating distinct electromagnetic isolation zones between adjacent signal transmission lines, thereby reducing cross-talk and electromagnetic interference while maintaining overall structural functionality
Solution Approach 2:
The harmful electromagnetic coupling between adjacent signal lines is addressed by extracting the continuous reference plane structure and removing portions (separation slots) to prevent the propagation of electromagnetic noise. This extraction eliminates the harmful interaction path while preserving the necessary reference potential for signal transmission
2Productivity
If signal transmission lines are placed close together to increase density, then productivity and space utilization improve, but cross-talk and electromagnetic interference worsen
Solution Approach 1:
By segmenting the reference transmission plane into isolated regions through separation slots, the patent enables closer placement of signal transmission lines without increasing electromagnetic interference. Each signal line has its own dedicated reference transmission region, allowing high-density routing while maintaining electromagnetic isolation between adjacent lines
Solution Approach 2:
The reference transmission plane is configured with non-uniform local characteristics - continuous regions under individual signal lines for optimal signal reference, and separated regions between lines for electromagnetic isolation. This local differentiation allows high signal density while preventing cross-talk through strategically placed separation slots
3Speed
If higher-frequency signals are transmitted to improve data rate, then speed increases, but cross-talk and electromagnetic interference increase, degrading reliability
Solution Approach 1:
The separation slots in the reference transmission plane create electromagnetic isolation zones that become increasingly effective at higher frequencies. By segmenting the reference plane, the patent suppresses high-frequency electromagnetic noise and cross-talk, enabling reliable high-speed signal transmission without the degradation that would otherwise occur at elevated frequencies
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 introduction of separation slots in the reference transmission plane effectively reduces cross-talk and electromagnetic wave noise interference, enhancing the transmission characteristics and performance of signal transmission circuits, particularly in higher-frequency regions.
Implementation Method 1
the reference transmission plane including at least one separation slot... effectively reduces cross-talk and electromagnetic wave noise interference
Data Source
AI summary
A signal transmission circuit and method thereof are provided. The signal transmission circuit may include a plurality of signal transmission lines, each of the plurality of signal transmission lines configured to transfer data via signal currents and a reference transmission plane configured to transfer return currents corresponding to the signal currents, the reference transmission plane separated from each of the plurality of signal transmission lines by an insulating layer, the reference transmission plane including at least one separation slot.