Integrated Circuit Routing via Dummy Patterns on Metal Tracks
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Solution Overview
Problem
The challenge in integrated circuit manufacturing lies in achieving an increased degree of freedom in routing while maintaining a full-track structure across multiple metal layers, as the density of interconnecting lines increases with decreasing gate length and pitch, making it difficult to satisfy the tip-to-tip space requirements.
Innovation Solution
The introduction of dummy and extension patterns on specific metal layers between adjacent cell patterns, which are electrically separated from other patterns, allows for the satisfaction of tip-to-tip space requirements, thereby enhancing the degree of freedom in routing and facilitating the formation of full-track structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the density of interconnecting lines is increased to accommodate decreasing gate length and pitch, then the integration density is improved, but the tip-to-tip space requirements become difficult to satisfy
Solution Approach 1:
The patent applies segmentation by dividing the metal layer into multiple tracks, each track containing multiple patterns. This segmentation allows independent control and optimization of spacing within each track while maintaining high overall line density. The track-based organization enables selective application of spacing rules to different regions, resolving the conflict between high density and manufacturing precision.
Solution Approach 2:
The patent implements local quality by applying different spacing requirements to different locations within the metal layer. Specifically, patterns within the same track maintain consistent spacing, while different tracks can have different spacing characteristics. This local optimization ensures that tip-to-tip space requirements are satisfied in critical areas while maintaining high overall interconnect density.
2Adaptability or versatility
If the degree of freedom in routing is increased, then the routing flexibility is improved, but the difficulty in satisfying tip-to-tip space requirements increases
Solution Approach 1:
The track-based segmentation provides a structured framework that enables routing flexibility within defined boundaries. Each track serves as an independent routing channel, allowing designers to route signals freely within the track while the track structure itself ensures compliance with tip-to-tip spacing requirements. This segmentation resolves the contradiction by providing freedom within constraints.
Solution Approach 2:
The patent introduces a track dimension as an intermediate level of organization between individual patterns and the overall metal layer. This additional dimensional structure enables routing flexibility in the pattern selection and connection aspects, while the track-based organization maintains control over spacing requirements, effectively resolving the contradiction through dimensional hierarchy.
3Stability of the object's composition
If a full-track structure is maintained across metal layers, then the manufacturing consistency is improved, but the difficulty in accommodating high line density increases
Solution Approach 1:
The patent maintains full-track structure by organizing patterns into complete tracks that span across the metal layer. Each track is treated as a complete unit with consistent spacing rules, ensuring manufacturing consistency. The segmentation into tracks allows the full-track structure to be maintained while the multi-track organization within each metal layer accommodates high line density through efficient space utilization.
Solution Approach 2:
The patent combines multiple tracks within each metal layer to achieve high line density while maintaining the full-track structure. By merging several tracks that each satisfy the full-track requirement, the overall system achieves both manufacturing consistency and high density. The tracks work together as an integrated system, resolving the apparent contradiction between structure consistency and density.
Data Source
AI summary
An integrated circuit including a plurality of stacked metal layers and a method of manufacturing the integrated circuit are provided. The method includes: providing a plurality of standard cells, each of which includes cell patterns respectively formed on the plurality of metal layers; and forming, on a particular metal layer among the plurality of metal layers which includes patterns extending in a first direction that are respectively formed on a plurality of tracks that are spaced apart from each other in a second direction, an additional pattern between adjacent patterns formed on a particular track of the plurality of tracks based on an interval between the adjacent patterns exceeding a reference value.