3D Chip Stack Plan for Heterogeneous Integration
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Solution Overview
Problem
In 3D chip stacks, integrating smaller accelerator or redundancy chips with larger main processor chips is challenging due to inefficiencies in silicon use and uneven heat dissipation, leading to hot spots and alignment issues, especially when thermal interface materials do not cover smaller chips properly.
Innovation Solution
A computer program product generates a 3D chip stack plan that includes a host layer with dedicated regions for heterogeneous chips, using thermally conductive materials and programmable connections to ensure even heat dissipation and alignment, allowing for the efficient integration of chips with varying sizes and technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If smaller accelerator or redundancy chips are integrated with larger main processor chips in 3D stacks, then yield and cost efficiency are improved, but silicon use efficiency deteriorates and alignment issues occur
Solution Approach 1:
The patent divides the chip stack into a main processor layer and separate accelerator/redundancy layers. Each layer can be manufactured independently with optimized silicon usage, and smaller chips are placed only where needed rather than forcing all chips to the same size. This segmentation allows efficient silicon utilization while maintaining high yield through separate manufacturing processes.
Solution Approach 2:
The patent implements local quality by providing different chip sizes and types in different regions of the 3D stack. The main processor layer contains larger chips, while accelerator and redundancy layers contain smaller chips positioned only where functionally required. This local differentiation optimizes silicon usage in each specific region rather than using uniform chip sizes throughout.
2Productivity
If smaller chips are placed in 3D stack layers, then yield and cost efficiency are improved, but heat dissipation uniformity deteriorates causing hot spots
Solution Approach 1:
The patent applies local quality by implementing region-specific thermal management strategies. Different thermal interface materials with appropriate thermal conductivities are used in different regions of the stack. Areas with smaller chips that generate less heat receive different thermal management treatment compared to regions with larger main processor chips, ensuring uniform heat dissipation across the entire stack despite varying chip sizes.
Solution Approach 2:
The patent introduces thermal interface materials as intermediaries between the chip layers and heat sink structures. These intermediary materials fill gaps and ensure optimal thermal contact, particularly in regions where smaller chips are integrated, thereby preventing hot spots and maintaining uniform heat dissipation across heterogeneous chip configurations.
3Productivity
If smaller chips are integrated in 3D stacks, then yield and cost efficiency are improved, but thermal interface material coverage deteriorates
Solution Approach 1:
The patent implements local quality by applying thermal interface materials specifically tailored to each region's requirements. In areas with smaller accelerator or redundancy chips, the thermal interface material application is optimized to provide appropriate coverage without waste, ensuring full thermal contact for each chip size and type in its specific location within the stack.
4Productivity
If heterogeneous chip sizes are integrated, then yield and cost efficiency are improved, but alignment precision deteriorates
Solution Approach 1:
The patent segments the manufacturing process into separate stages for different chip types and sizes. Alignment features and positioning structures are specifically designed for each layer type, allowing precise alignment of smaller accelerator chips and redundancy chips independently from the main processor layer. This segmented approach to manufacturing maintains high alignment precision despite heterogeneous chip sizes.
Solution Approach 2:
The patent applies local quality by implementing region-specific alignment features and positioning structures tailored to each chip type and size. Each layer contains customized alignment markers and positioning elements that optimize alignment precision for that specific region's chip configuration, rather than using a single alignment system for all chip sizes.
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 solution enhances modularity and heat management in 3D chip stacks, improving yield and cost efficiency by allowing for the separate manufacture and placement of heterogeneous chips, ensuring even heat dissipation and proper alignment, thus addressing the inefficiencies in existing integration methods.
Implementation Method 1
using thermally conductive materials and programmable connections to ensure even heat dissipation and alignment
Data Source
AI summary
A computer program product for generating and implementing a three-dimensional (3D) computer processing chip stack plan. The computer readable program code includes computer readable program code configured for receiving system requirements from a plurality of clients, identifying common processing structures and technologies from the system requirements, and assigning the common processing structures and technologies to at least one layer in the 3D computer processing chip stack plan. The computer readable program code is also configured for identifying uncommon processing structures and technologies from the system requirements and assigning the uncommon processing structures and technologies to a host layer in the 3D computer processing chip stack plan. The computer readable program code is further configured for determining placement and wiring of the uncommon structures on the host layer, storing placement information in the plan, and transmitting the plan to manufacturing equipment. The manufacturing equipment forms the 3D computer processing chip stack.