Multilayer Substrate Via Structure for Impedance Matching
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Solution Overview
Problem
In multilayer substrates with differential lines, the connecting via portions experience issues with unnecessary radiation and impedance mismatching due to limitations in reducing via diameter and distance, leading to signal reflection and distortion.
Innovation Solution
The multilayer substrate design incorporates first and second parallel conductors with interlayer connecting conductors that cross each other, generating increased capacitance between them, thereby reducing unnecessary radiation and impedance mismatching at the connecting portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the via diameter and distance between vias are reduced to minimize occupation area, then the size of the device is reduced, but manufacturing precision becomes difficult to achieve and signal integrity deteriorates due to impedance mismatching
Solution Approach 1:
The patent transitions from a single-layer via structure to a three-dimensional multilayer structure with multiple vias arranged vertically and horizontally across different layers. This dimensional expansion allows the via group to achieve the required impedance matching and capacitance compensation functions that cannot be realized with single-layer vias, while maintaining compact horizontal footprint.
Solution Approach 2:
The via structure is segmented into multiple individual vias arranged in a group configuration across different layers. Instead of using a single large via or sparse via distribution, the patent divides the via function into multiple smaller via elements that can be precisely positioned and controlled during manufacturing, improving both manufacturing precision and electrical performance.
2Area of stationary object
If the via diameter and distance between vias are reduced to minimize occupation area, then the size of the device is reduced, but unnecessary radiation increases affecting adjacent circuits
Solution Approach 1:
The patent converts the potentially harmful radiation effect into a beneficial shielding effect. By arranging multiple vias in a dense group configuration across different layers, the structure creates electromagnetic shielding that contains and directs the radiation patterns, preventing unnecessary radiation from propagating to adjacent circuits while maintaining compact size.
3Ease of manufacture
If the via structure is simplified to ease manufacturing, then manufacturing precision improves, but impedance mismatching and signal reflection increase
Solution Approach 1:
The patent utilizes parameter changes in the via group configuration, including varying the number of vias, their diameters, spacing, and distribution across different layers. By adjusting these parameters, the structure achieves the required impedance matching and capacitance values to eliminate signal reflection and maintain signal integrity, while the via group formation process remains compatible with standard manufacturing techniques.
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
This design effectively reduces unnecessary radiation and impedance mismatching, maintaining signal integrity and balance in the differential line.
Implementation Method 1
a capacitance component is generated between the first parallel conductors and the second parallel conductors. In addition, the capacitance component generated between the first interlayer connecting conductors and the second interlayer connecting conductors increases
Data Source
AI summary
A multilayer substrate includes a differential line including first and second line conductors provided on or in a laminated body including base material layers. The differential line includes line portions and a connecting portion that connects the line portions. The connecting portion includes first parallel conductors extending in parallel or substantially in parallel with each other, first interlayer connecting conductors that connect the first parallel conductors in parallel, and connect the first line conductor to the first parallel conductors, second parallel conductors extending in parallel or substantially in parallel with each other, and second interlayer connecting conductors that connect the second parallel conductors in parallel, and connect the second line conductor to the second parallel conductors. The first parallel conductors cross the second parallel conductors as viewed in a laminating direction of the base material layers.