Wiring Structure with Variable Spacing for Crosstalk Reduction
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Solution Overview
Problem
Densely packed wiring patterns on printed wiring substrates experience increased crosstalk noise due to capacitive and inductive coupling, making it difficult to miniaturize electronic devices and maintain timing control in high-speed interfaces, as existing solutions require significant wiring space and uneven wiring lengths.
Innovation Solution
A wiring structure with parallel wiring portions and intersecting wiring path change portions, where the interval between wiring patterns is wider in the path change portions than in the parallel portions, allowing for reduced crosstalk noise without increasing the overall wiring space and minimizing differences in wiring lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wiring patterns are densely disposed in parallel to miniaturize electronic apparatus, then the area of the electronic apparatus is reduced, but crosstalk noise increases due to capacitive and inductive coupling between adjacent wiring patterns
Solution Approach 1:
The patent applies local quality by varying the interval between wiring patterns at different locations along the parallel wiring portion. Specifically, a first interval is set in a first region and a second interval (different from the first) is set in a second region, allowing the wiring structure to have different local characteristics. This enables reduced crosstalk noise in specific regions while maintaining dense overall wiring arrangement, thus miniaturizing the electronic apparatus without excessive crosstalk.
2Object-generated harmful factors
If one wiring is bent to reduce crosstalk by creating different transfer lengths, then crosstalk energy is dispersed, but the wiring length difference becomes problematic for timing control in high-speed interfaces
Solution Approach 1:
Instead of bending the entire wiring to create length differences, the patent applies local quality by modifying only specific regions (first and second regions) along the parallel wiring portion. By setting different intervals in these local regions, the patent achieves crosstalk reduction without creating significant overall wiring length differences, thus avoiding timing control issues in high-speed interfaces.
3Object-generated harmful factors
If the interval between wiring patterns is increased in path change portions, then capacitive and inductive coupling is reduced, but the wiring space increases
Solution Approach 1:
The patent applies local quality by increasing the interval between wiring patterns only in specific regions (first and second regions) where path changes occur, rather than uniformly increasing the interval across the entire wiring structure. This localized approach reduces capacitive and inductive coupling at critical points while minimizing the overall increase in wiring space, allowing for more efficient space utilization.
Data Source
AI summary
A wiring structure includes a plurality of wiring patterns. An interval between the adjacent wiring patterns is shortened in the parallel wiring portions. In wiring path change portions, the wiring patterns are extended at a slope with respect to an X direction, and an interval between the adjacent wiring patterns is more widened than the interval. A crosstalk noise can be reduced by widening the interval between the wiring patterns using the wiring path change portions without making an area occupied by a wiring region extremely increased.