Offset-Stacked Chip Package Layout for Lower Crosstalk
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Solution Overview
Problem
The challenge is to create a semiconductor package that efficiently integrates multiple semiconductor chips for high-volume data processing while maintaining a compact size, as existing technologies face limitations in chip stacking and interconnection density, leading to issues with crosstalk and increased material usage.
Innovation Solution
The semiconductor package employs offset-stacked semiconductor chips with horizontal and vertical common interconnectors, reducing the number of vertical interconnectors and increasing their spacing to decrease crosstalk and material usage, while using a package redistribution layer and vertical interconnectors to facilitate signal and power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple semiconductor chips are stacked vertically to increase integration density, then data processing capacity is improved, but crosstalk between adjacent chips increases
Solution Approach 1:
The patent transitions from conventional vertical stacking to offset-stacked configuration where chips are arranged in alternating lateral positions between adjacent vertical levels. This dimensional rearrangement increases lateral spacing between chips, reducing electromagnetic crosstalk while maintaining vertical integration for high data processing capacity.
Solution Approach 2:
The patent segments the vertical stack into multiple groups with different lateral offsets. By dividing the monolithic vertical stack into segmented groups that alternate positions, the design reduces continuous vertical coupling and minimizes crosstalk between adjacent chips while preserving overall integration density.
2Productivity
If conventional vertical stacking is used to increase chip density, then integration is improved, but the number of vertical interconnectors increases leading to more material usage
Solution Approach 1:
The patent merges multiple vertical interconnector functions into shared horizontal interconnectors that serve multiple chip interfaces. By combining interconnection paths and using common horizontal routing layers, the design reduces the total number of vertical interconnectors and associated materials while maintaining full connectivity.
Solution Approach 2:
The patent implements universal horizontal interconnector layers that perform multiple functions: inter-chip communication, power distribution, and signal routing. These multi-functional interconnectors replace numerous specialized vertical connections, reducing material usage while achieving the same integration density.
3Object-generated harmful factors
If chips are offset-stacked to reduce vertical interconnector density, then crosstalk is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent employs asymmetric offset patterns in chip stacking where alternating chips are positioned at different lateral offsets rather than perfect alignment. This asymmetric arrangement naturally reduces crosstalk through increased spacing while the repeating pattern maintains manufacturing simplicity through periodicity.
Solution Approach 2:
The patent applies local quality variations by implementing offset configurations only in specific regions where crosstalk is most problematic, while maintaining conventional alignment in other areas. This selective application reduces overall crosstalk without requiring complete redesign of the entire stack, thereby limiting manufacturing complexity increases.
Data Source
AI summary
A semiconductor package includes: semiconductor chips being offset-stacked to expose edge regions adjacent to first side surfaces; chip pads disposed in each of the edge regions of the semiconductor chips, the chip pads including a plurality of first chip pads arranged in a first column and a plurality of second chip pads arranged in a second column; a horizontal common interconnector having one end connected to the second chip pad of a semiconductor chip of the semiconductor chips, and another end connected to the first chip pad of another semiconductor chip; and a vertical common interconnector having one end connected to the second chip pad of the uppermost semiconductor chip, which is electrically connected to the first chip pad of the uppermost semiconductor chip connected to the horizontal common interconnector.