IC Layout Cell Configuration to Minimize Dummy Fill
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Solution Overview
Problem
As technology advances and the demand for scaled integrated circuits (ICs) increases, the challenge of fitting an increasing number of layout cells in smaller IC designs while minimizing the insertion of dummy fill structures becomes significant, posing challenges for IC manufacturers.
Innovation Solution
The introduction of layout cells with different configurations, including layout units representing transistors and circuits, optimized for uniformity and minimized dummy fill structures, using electronic design automation (EDA) tools to enhance circuit implementation and manufacturing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of layout cells is increased to meet scaled IC demands, then circuit functionality is improved, but the area available for each cell decreases and dummy fill insertion increases
Solution Approach 1:
The layout cell is divided into multiple layout units, each representing a transistor or circuit component. This segmentation allows for modular arrangement and optimization of space utilization, enabling increased circuit functionality within reduced area constraints
Solution Approach 2:
The patent introduces different configurations (e.g., horizontal vs. vertical orientations, various interconnect patterns) to arrange layout units, effectively utilizing two-dimensional space in novel ways to pack more functional elements into smaller areas
2Area of stationary object
If layout cells are densely packed to reduce IC size, then area efficiency is improved, but pattern variations increase and manufacturing yield decreases
Solution Approach 1:
The patent employs multiple layout units with identical or similar geometric patterns and configurations within each layout cell. This homogeneity reduces pattern variations across the IC layout, improving manufacturing precision and yield while maintaining area efficiency
Solution Approach 2:
The patent systematically varies parameters such as the orientation and interconnect configuration of layout units to create different cell configurations, allowing optimization of both density and pattern uniformity for specific design requirements
3Manufacturing precision
If dummy fill structures are inserted to maintain manufacturing quality, then manufacturing precision is improved, but the number of mask changes increases
Solution Approach 1:
The patent pre-configures layout cells with multiple layout units arranged in patterns that inherently satisfy manufacturing requirements, reducing the need for post-placement dummy fill insertion and minimizing mask changes
Solution Approach 2:
The patent converts the constraint of limited cell area into a benefit by designing compact layout unit configurations that naturally achieve good manufacturing characteristics without requiring extensive dummy fill, thus reducing overall design complexity
Data Source
AI summary
The present disclosure describes an example method for cell placement in an integrated circuit (IC) layout design. The method includes defining a layout unit for a circuit implementation and arranging multiple layout units into a layout cell. The method also includes editing the layout cell to connect a first set of the layout units to be representative of the circuit implementation and to connect a second set of the layout units to be representative of a non-functional circuit. Further, the method includes inserting one or more dummy fill structures in areas of the layout cell unoccupied by the first and second sets of layout units.