Differential Transmission Board Layout for Timing and Impedance Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional connecting members for differential signals suffer from signal transmission time delays and impedance inconsistencies due to differences in transmission path lengths, which can lead to signal distortion and misjudgment.
Innovation Solution
A transmission board and connecting member design that incorporates a timing compensation section and a grounding structure to equalize transmission path lengths and adjust capacitance effects, reducing signal reflection and improving impedance consistency between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a snake-shaped bending section is provided on the shorter signal conductor to equalize transmission path lengths, then signal transmission time delay is reduced, but impedance consistency deteriorates due to varying gaps between conductors
Solution Approach 1:
The transmission board divides the transmission path into distinct segments: a straight section and a timing compensation section. This segmentation allows the straight section to maintain consistent impedance through uniform conductor spacing, while the timing compensation section independently adjusts path length without compromising the impedance stability of the main transmission path.
Solution Approach 2:
The invention introduces a grounding structure as an intermediary element positioned between the first and second channels. This grounding structure acts as a mediator that stabilizes the electromagnetic environment, providing a reference potential that helps maintain consistent impedance characteristics even when the timing compensation section creates varying gaps between conductors.
2Loss of time
If the transmission path length of one channel is extended to match the other channel, then transmission time delay is reduced, but the capacitance effect and impedance vary at different locations
Solution Approach 1:
The invention applies local quality by creating distinct structural characteristics in different sections of the transmission path. The timing compensation section has a specific configuration optimized for time delay adjustment, while the straight section maintains a different configuration optimized for impedance consistency. Each section has locally optimized properties suitable for its specific function.
Solution Approach 2:
The grounding structure serves as an intermediary that stabilizes the varying capacitance effects created by the timing compensation section. By providing a controlled reference potential and electromagnetic boundary, the grounding structure compensates for the impedance variations that would otherwise result from the extended transmission path.
3Reliability
If grounding structure is positioned between timing compensation section and second channel, then impedance consistency is improved, but the first distance becomes greater than the second distance
Solution Approach 1:
The invention utilizes parameter changes by adjusting the grounding structure's position, size, and electrical characteristics to optimize impedance consistency. By modifying these parameters of the grounding structure, the patent achieves improved impedance matching while accepting a controlled increase in the path length difference, which is compensated through the grounding effect rather than requiring perfectly equal path lengths.
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 reduces signal transmission time delays and enhances impedance consistency across differential channels, facilitating accurate signal processing and reducing the risk of signal loss or distortion.
Implementation Method 1
the capacitance effect between the timing compensation section and the second channel is adjusted by the grounding structure, thus adjusting the impedance thereof
Data Source
AI summary
A transmission board includes: an insulating carrier; a pair of differential channels, including a first channel and a second channel; and a grounding structure, provided in the insulating carrier. An inner side of the first channel and an inner side of the second channel are separated from and coupled to each other. The first channel has a timing compensation section and a connecting section connected to the timing compensation section. A distance between an inner side of the timing compensation section and the inner side of the second channel is defined as a first distance. A distance between an inner side of the connecting section and the inner side of the second channel is defined as a second distance. The first distance is greater than the second distance. The grounding structure is located between the inner side of the timing compensation section and the inner side of the second channel.