Image Reading Substrate Equalized Interconnects for Signal Jitter Reduction
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Solution Overview
Problem
In image reading devices, the existing interconnect configurations between image reading elements and high-speed serial drivers lead to signal jitter due to unequal signal line lengths, affecting the speed and reliability of high-speed serial signal transmission.
Innovation Solution
The image reading substrate is designed with equalized interconnect distances between the image reading element's output terminals and the high-speed serial driver, using symmetric or meander interconnect patterns to ensure consistent signal propagation times and reduce jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unequal interconnect distances are used between output terminals and high-speed serial driver, then device complexity is reduced, but signal jitter increases affecting transmission reliability
Solution Approach 1:
The patent applies asymmetry by intentionally introducing unequal dummy interconnects to compensate for inherently unequal signal path lengths. The dummy interconnects are added selectively to shorter paths to match the length of longer paths, transforming the asymmetric problem into a symmetric solution while maintaining signal integrity at high speeds
2Reliability
If equal interconnect distances are set between output terminals and high-speed serial driver, then signal jitter is reduced improving transmission reliability, but device complexity increases due to symmetric or meander interconnect patterns
Solution Approach 1:
The patent uses meander interconnect patterns that incorporate curved and serpentine paths to equalize signal lengths. These curved interconnects allow flexible routing to achieve equal lengths while managing spatial constraints on the substrate, transforming straight-line distance problems into curved path solutions
3Manufacturing precision
If equal interconnect distances are used, then signal propagation times are equalized reducing jitter, but interconnect length increases affecting signal speed
Solution Approach 1:
The patent resolves the length contradiction by utilizing the third dimension (vertical layering) through multi-layer substrate routing. Instead of extending interconnects horizontally to equalize lengths, the design routes signals through different layers, achieving length equalization without excessive horizontal space consumption and maintaining compact device footprint
Data Source
AI summary
An image reading substrate includes: an image reading unit that assigns read signals of an image to plural output terminals and outputs the read signals; at least one high-speed serial transmitting unit that is connected to the plural output terminals; and an outputting unit that outputs a high-speed serial signal outside, the high-speed serial signal being transmitted from the high-speed serial transmitting unit, in which at least distances of interconnects from the plural output terminals to the high-speed serial transmitting unit are set to be equal.