Overlapping Reticle Field Interconnects for Large IC Fabrication
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Solution Overview
Problem
Current photolithographic processes are limited by the standard reticle field size, which restricts the fabrication of integrated circuit devices to sizes smaller than 33 mm by 26 mm, leading to inefficiencies in computationally intensive applications and increased fabrication costs due to the need for separate reticle sets for similar architectures with different core quantities.
Innovation Solution
The technique involves overlapping adjacent reticle fields to form overlapping conductive interconnects that connect integrated circuits across reticle fields, allowing for the creation of larger integrated circuit devices and enabling the use of a single reticle set for various die configurations with different core counts by spanning the common scribe zone between reticle fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single reticle is used for patterning, then manufacturing precision is maintained within standard limits, but the device size is restricted to smaller than 33 mm by 26 mm
Solution Approach 1:
The patent divides a large integrated circuit device into multiple reticle fields that are patterned separately and then stitched together. Each reticle field is patterned with standard precision, and the segmentation allows the overall device to exceed the standard reticle size limit of 33 mm by 26 mm while maintaining manufacturing precision through controlled stitching processes.
Solution Approach 2:
The patent introduces stitching interconnects as intermediary structures that bridge adjacent reticle fields. These stitching interconnects include alignment marks and conductive pathways that facilitate precise registration and electrical connection between multiple reticle fields, enabling large device fabrication while maintaining alignment precision.
2Adaptability or versatility
If separate reticle sets are used for different core quantities, then manufacturing precision is maintained for each configuration, but device complexity increases
Solution Approach 1:
The patent creates a universal reticle set that can pattern multiple core configurations through the use of stitching interconnects and modular design. A single reticle can be used to fabricate devices with different core quantities by strategically placing and connecting stitching interconnects, eliminating the need for separate reticle sets for each configuration and reducing overall device complexity.
3Area of stationary object
If multiple reticle fields are overlapped to form larger devices, then device size increases, but manufacturing precision deteriorates due to alignment challenges
Solution Approach 1:
The patent incorporates alignment marks and stitching interconnect structures into the reticle pattern design before fabrication. These preliminary features are built into each reticle field and facilitate precise registration during the stitching process, enabling multiple reticle fields to be overlapped and connected with high alignment precision despite the increased device area.
4Productivity
If standard reticle field sizes are used, then ease of manufacture is maintained, but productivity decreases for computationally intensive applications
Solution Approach 1:
The patent segments large computationally intensive devices into multiple reticle fields that can be patterned using standard reticle sizes and processes. This segmentation maintains ease of manufacture by utilizing existing standard reticle fabrication capabilities while improving productivity by enabling the creation of larger, more powerful devices that would otherwise require complex custom reticle sets.
Data Source
AI summary
Techniques are described for fabricating integrated circuit devices that span multiple reticle fields. Integrated circuits formed within separate reticle fields are placed into electrical contact with each other by overlapping reticle fields to form an overlapping conductive interconnect. This overlapping conductive interconnect electrically connects an interconnect layer of a first reticle field with an interconnect layer of a second, laterally adjacent reticle field. The overlapping conductive interconnection extends into a common scribe zone between adjacent reticle fields.