Cross-talk Prevention Ring for TSV Isolation in 3D ICs
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Solution Overview
Problem
Three-dimensional integrated circuits (3DIC) and stacked dies face significant cross-talk issues due to the increased number and length of interconnections, particularly through-silicon vias (TSVs), which can lead to performance degradation, especially in analog circuits or high-frequency operations.
Innovation Solution
The implementation of a cross-talk prevention ring, preferably grounded, encircling device regions and TSVs, isolated by seal rings to minimize interference between TSVs and active devices, utilizing interconnected metal lines, vias, and contact plugs to form a noise-free signal ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through-silicon vias (TSVs) are used to connect dies and provide grounding paths, then integration density and electrical connection are improved, but cross-talk with integrated circuits increases causing performance degradation
Solution Approach 1:
The device region is divided into multiple segments, with each segment containing active devices enclosed by its own cross-talk prevention ring. This segmentation isolates the electromagnetic fields generated by TSVs from active devices, preventing cross-talk while maintaining electrical connection functionality.
Solution Approach 2:
Cross-talk prevention rings are introduced as intermediary structures between TSVs and active devices. These rings act as electromagnetic shields that block the harmful electromagnetic fields from TSVs from reaching the active devices, thereby eliminating cross-talk while preserving the beneficial electrical connection provided by TSVs.
2Productivity
If the number of devices and interconnections is increased, then integration density is improved, but circuit RC delay and power consumption increase
Solution Approach 1:
The patent transitions from two-dimensional planar interconnection to three-dimensional vertical interconnection using TSVs. This dimensional change allows signals to travel shorter vertical paths through the substrate, reducing RC delay despite increased device density, and enables better heat dissipation in the third dimension.
3Reliability
If TSVs are used for signal and ground paths, then electrical connectivity is improved, but electromagnetic interference with analog circuits increases
Solution Approach 1:
Different regions of the semiconductor device are assigned different qualities: device regions contain active devices with specific electromagnetic characteristics, while TSV regions contain through-silicon vias with grounding capabilities. The cross-talk prevention rings provide localized electromagnetic shielding at the boundaries between these regions, allowing each region to maintain its optimal electrical characteristics without interfering with others.
Data Source
AI summary
A semiconductor chip includes a through-silicon via (TSV), a device region, and a cross-talk prevention ring encircling one of the device region and the TSV. The TSV is isolated from substantially all device regions comprising active devices by the cross-talk prevention ring.