Deep and Shallow Interconnect Lines for Lower RC Delay
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Solution Overview
Problem
The miniaturization of integrated circuits has led to stricter design and manufacturing specifications, as well as reliability challenges, particularly in ensuring optimal signal propagation times due to the RC constant of conducting paths, which existing technologies have not adequately addressed.
Innovation Solution
The integration of deep lines and shallow lines in multiple conductive layers within integrated circuits, with specific configurations of low resistivity and low capacitivity portions, and strategically placed mutation points to reduce signal propagation time delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conducting path uses deep lines only, then the resistivity is reduced, but the capacitivity increases
Solution Approach 1:
The conducting path is segmented into multiple portions with different line depths. Some portions use deep lines to reduce resistivity, while other portions use shallow lines to reduce capacitivity. This segmentation allows the conducting path to optimize different electrical characteristics in different segments, resolving the contradiction between low resistivity and low capacitivity requirements.
Solution Approach 2:
Different portions of the conducting path are assigned different local qualities (depths) based on their specific functional requirements. Mutation points are strategically placed to transition between deep and shallow line configurations, allowing each local segment to have optimized properties for its particular role in signal propagation.
2Reliability
If the conducting path uses shallow lines only, then the capacitivity is reduced, but the resistivity increases
Solution Approach 1:
The conducting path is divided into segments where shallow lines are used in portions requiring low capacitivity (such as areas with high signal transition activity), while deep lines are used in other portions where low resistivity is more critical. This segmented approach resolves the contradiction by allowing each segment to optimize for its dominant requirement.
Solution Approach 2:
Shallow line configurations are applied locally in specific portions of the conducting path where capacitive effects are most problematic, while maintaining deep line configurations in other portions. This local application of different line depths resolves the contradiction between reducing capacitivity and maintaining acceptable resistivity.
3Loss of time
If the RC constant is reduced, then the signal propagation time delay is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
Rather than requiring all lines to be uniformly deep (which would minimize RC constant but maximize manufacturing complexity), the path is segmented into deep and shallow portions. This allows the RC constant to be reduced through strategic deep line usage while avoiding the manufacturing precision challenges of uniformly deep lines throughout the entire path.
Solution Approach 2:
The line depth parameter is changed selectively along the conducting path rather than maintaining a uniform value. By transitioning between deep and shallow line configurations at mutation points, the RC constant is optimized for signal propagation while the manufacturing precision requirements are managed through controlled parameter transitions rather than uniform high-precision requirements throughout.
Data Source
AI summary
An integrated circuit includes a plurality of first layer deep lines and a plurality of first layer shallow lines. The integrated circuit also includes a plurality of second layer deep lines and a plurality of second layer shallow lines. Each of the first layer deep lines and the first layer shallow lines is in a first conductive layer. Each of the second layer deep lines and the second layer shallow lines is in a second conductive layer above the first conductive layer.