Shielded TSV Structures for Low Cross-Talk Silicon Interconnect Dies
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Solution Overview
Problem
High-frequency signal transmission through silicon interconnect dies in composite interposers faces challenges due to cross-talk between neighboring through-substrate via structures, which degrades the signal-to-noise ratio.
Innovation Solution
The implementation of metallic shield structures, including front and backside metallic shield layers, and insulating spacer layers to reduce electromagnetic coupling between through-substrate via structures, thereby enhancing the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If through-substrate via structures are used for high-frequency signal transmission, then signal transmission capability is improved, but cross-talk between neighboring vias increases
Solution Approach 1:
The patent introduces an insulating spacer layer as an intermediary substance between neighboring through-substrate via structures. This spacer layer physically separates the vias and electrically isolates them, preventing electromagnetic coupling and cross-talk while maintaining the high-frequency signal transmission capability of the via structures
Solution Approach 2:
The patent extracts and removes the harmful electromagnetic field interaction between neighboring vias by introducing shielding structures and insulating materials that isolate each via's electromagnetic field, preventing the harmful cross-talk effect while preserving the useful signal transmission function
2Reliability
If metallic shield structures are added to reduce cross-talk, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent segments the shielding function into multiple discrete components: individual insulating spacer layers positioned between specific neighboring via pairs, and selective metallic shield layers applied to specific via structures. This segmented approach provides effective cross-talk reduction while avoiding the complexity of complete universal shielding
Solution Approach 2:
The patent applies shielding and insulation measures locally rather than uniformly across all via structures. Insulating spacer layers are placed only between neighboring vias where cross-talk occurs, and metallic shield layers are applied selectively, providing targeted noise reduction without unnecessarily increasing overall device complexity
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 use of metallic shield structures effectively mitigates cross-talk, leading to an improved signal-to-noise ratio and better signal fidelity in high-frequency applications.
Implementation Method 1
The implementation of metallic shield structures, including front and backside metallic shield layers, and insulating spacer layers to reduce electromagnetic coupling between through-substrate via structures
Data Source
AI summary
A silicon interconnect die includes through-substrate via (TSV) structures extending through a silicon substrate; an insulating spacer layer including a horizontally-extending portion overlying a top surface of the silicon substrate and a plurality of tubular insulating material portions laterally surrounding a respective one of the TSV structures; and a front metallic shield layer including a horizontally-extending metallic shield portion and at least one tubular metallic shield portion laterally surrounding a respective one of the tubular insulating material portions.