Conductive Vias With Segmented Interconnects For Signal Integrity
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Solution Overview
Problem
Conductive vias in circuit boards and substrates often create return path discontinuities when used for differential signaling, leading to noise and signal degradation due to varying distances between conductive traces and interconnecting members.
Innovation Solution
The design includes a substrate with conductive traces and interconnecting members that maintain a constant distance between corresponding traces, minimizing return path discontinuities by ensuring the distance between interconnecting members equals the trace separation, thereby improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive vias are used with single interconnecting members, then the structure is simple and easy to manufacture, but return path discontinuities occur leading to noise and signal degradation
Solution Approach 1:
The conductive via is segmented into multiple interconnecting members (first, second, third interconnecting members) instead of using a single continuous conductor. This segmentation allows the via to maintain multiple separated conductive paths that can independently manage return currents, thereby reducing return path discontinuities and improving signal quality for differential pairs.
Solution Approach 2:
The multiple interconnecting members are nested within the same via hole structure, with each interconnecting member positioned at different depths or locations within the via. This nesting approach allows complex multi-conductor functionality to be achieved within a compact via structure, improving signal quality without proportionally increasing overall via size.
2Reliability
If the distance between interconnecting members varies, then manufacturing is easier with standard processes, but noise increases and signal quality deteriorates
Solution Approach 1:
The via structure implements local quality control by ensuring that specific regions of the via maintain consistent spacing between interconnecting members. The first, second, and third interconnecting members are positioned with controlled pitch relationships, creating zones of consistent electrical characteristics that reduce noise while allowing manufacturing flexibility in other areas.
Solution Approach 2:
The invention controls the pitch or spacing parameter between interconnecting members to maintain consistent electrical characteristics. By carefully selecting and maintaining specific pitch values between the first, second, and third interconnecting members, the design achieves noise reduction through parameter optimization while remaining compatible with manufacturing capabilities.
Data Source
AI summary
Electronic devices include a substrate with first and second pairs of conductive traces extending in or on the substrate. A first conductive interconnecting member extends through a hole in the substrate and communicates electrically with a first trace of each of the first and second pairs, while a second conductive interconnecting member extends through the hole and communicates electrically with the second trace of each of the first and second pairs. The first and second interconnecting members are separated from one another by a distance substantially equal to a distance separating the conductive traces in each pair. Electronic device assemblies include a transmitting device configured to transmit a differential signal through a conductive structure to a receiving device. The conductive structure includes first and second pair of conductive traces with first and second interconnecting members providing electrical communication therebetween.