Standard Cell Conductive Line Cutting Layer for Routing
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Solution Overview
Problem
The design of semiconductor integrated circuits faces challenges in reducing time and cost due to the complexity of generating and realizing semiconductor integrated circuits, particularly in managing connections between components, which is exacerbated by the need for precise conductive line separation and routing in advanced semiconductor process technologies.
Innovation Solution
The integration of a cutting layer in the standard cell layout that extends across conductive lines to separate them into upper and lower segments, allowing for reduced spacing between conductive lines and enabling efficient electrical connections, thereby simplifying the routing process and adhering to stricter design rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conductive lines are separated into upper and lower segments using a cutting layer, then the interval between conductive lines is reduced and routing is simplified, but the device structure becomes more complex
Solution Approach 1:
The conductive lines are divided into upper and lower segments by introducing a cutting layer that extends in the first direction between active regions. This segmentation allows precise control over line separation and enables the conductive lines to be routed independently in different vertical positions, resolving the contradiction by achieving high separation precision through structural division.
Solution Approach 2:
The cutting layer introduces a vertical dimension (first direction) to the routing architecture, allowing conductive lines to be separated and connected across different vertical levels. This dimensional approach enables reduced horizontal spacing while maintaining electrical connectivity through vertical connections, thus reducing interval without proportionally increasing complexity.
2Adaptability or versatility
If the cutting layer is used to separate conductive lines, then spacing between lines is reduced and design adaptability is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The cutting layer serves multiple functions simultaneously: it separates conductive lines, defines active region boundaries, and enables vertical routing connections. This multi-functionality enhances design adaptability without requiring separate structures for each function, thereby limiting the increase in manufacturing complexity.
Solution Approach 2:
The cutting layer is merged with the active region structure, extending between active regions while simultaneously serving as a separation element for conductive lines. This merging of functions into a single structural element enhances design flexibility while consolidating the manufacturing process rather than adding separate steps.
3Productivity
If conductive lines are separated into upper and lower segments, then routing efficiency is improved and design rules are better adhered to, but the number of electrical connections required increases
Solution Approach 1:
By utilizing the vertical dimension through upper and lower conductive line segments, the routing efficiency is improved as lines can be positioned optimally without horizontal interference. The electrical connections between segments are managed through the cutting layer structure, which provides defined connection points, thereby organizing the increased connection requirements in a systematic manner that limits complexity growth.
Data Source
AI summary
An embodiment includes an integrated circuit comprising a standard cell, the standard cell comprising: first and second active regions having different conductivity types and extending in a first direction; first, second, and third conductive lines extending over the first and second active regions in a second direction substantially perpendicular to the first direction, and disposed parallel to each other; and a cutting layer extending in the first direction between the first and second active regions and separating the first conductive line into a first upper conductive line and a first lower conductive line, the second conductive line into a second upper conductive line and a second lower conductive line, and the third conductive line into a third upper conductive line and a third lower conductive line; wherein: the first upper conductive line and the third lower conductive line are electrically connected together; and the second upper conductive line and the second lower conductive line are electrically connected together.