Standard Cell Gate Line Segmentation for Cross-Couple Stability
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Solution Overview
Problem
In the development of integrated circuits, the down-scaling of standard cells has led to challenges in maintaining a layout that removes process risk patterns while adhering to design constraints, particularly in cross-couple structures, where the arrangement of gate lines and cutting layers affects the height and freedom in arranging contacts, impacting production yield and cell height.
Innovation Solution
The standard cell design includes first and second active regions with an intermediate region, where gate lines are divided by gap insulating layers, allowing for a 3CPP cross-couple structure with 1CPP cutting layers, increasing the degree of freedom in contact arrangement and reducing the height of the cross-couple region, thereby stabilizing the implementation of cross-couple structures even with decreased cell height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If standard cell height is decreased through down-scaling, then integration density is improved, but the freedom in arranging contacts and the stability of cross-couple structure implementation deteriorates
Solution Approach 1:
The gate line is divided into multiple segments (first gate line segment, second gate line segment, third gate line segment) separated by cutting layers. This segmentation allows independent positioning and arrangement of each segment, providing flexibility in contact placement while maintaining the overall cross-couple structure within the reduced cell height.
Solution Approach 2:
The patent introduces a vertical layering dimension by stacking gate line segments at different heights with cutting layers in between. This multi-level arrangement allows contacts to be positioned in the horizontal plane while the vertical separation provides additional design freedom, effectively decoupling the contact arrangement freedom from the cell height constraint.
2Area of moving object
If standard cell height is decreased through down-scaling, then integration density is improved, but the stability of cross-couple structure implementation deteriorates
Solution Approach 1:
Dividing the gate line into segments separated by cutting layers creates isolated regions that can be independently optimized and controlled. This segmentation reduces the risk of process variations affecting the entire structure, thereby improving implementation stability despite the reduced overall cell height.
Solution Approach 2:
Cutting layers are introduced as intermediary elements between gate line segments. These cutting layers act as mediators that provide electrical isolation and mechanical separation, ensuring stable and predictable behavior of the cross-couple structure during manufacturing processes even at scaled dimensions.
3Adaptability or versatility
If gate lines are divided by cutting layers, then the freedom in arranging contacts is improved, but the device complexity increases
Solution Approach 1:
The gate line is segmented into discrete sections by cutting layers, which simplifies the contact arrangement process by providing clearly defined separation points. Each segment can be independently connected to contacts, reducing the complexity of routing and connection planning compared to a continuous gate line structure.
Solution Approach 2:
By moving the separation function to the vertical dimension (using cutting layers between levels), the horizontal plane becomes simpler for contact arrangement. The complexity is shifted from the planar layout to the vertical stacking, making the overall design more manageable despite the added structural elements.
Data Source
AI summary
In one embodiment, the standard cell includes first and second active regions defining an intermediate region between the first and second active regions; and first, second and third gate lines crossing the first and second active regions and crossing the intermediate region. The first gate line is divided into an upper first gate line and a lower first gate line by a first gap insulating layer in the intermediate region, the second gate line is undivided, and the third gate line is divided into an upper third gate line and a lower third gate line by a second gap insulating layer in the intermediate region.