Semiconductor Gate Layout With Extra Via Landing Options
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Solution Overview
Problem
The miniaturization of integrated circuits (ICs) has led to increased routing complexity and challenges in interconnection structures due to reduced cell areas and higher transistor density, making it difficult to efficiently connect gate structures to conductive tracks.
Innovation Solution
Implementing a shortened continuous-poly-on-oxide-diffusion-edge (CPODE) and shifted cut-poly (CPO) patterns for forming non-functional gate structures, which provide additional options for landing vias and reduce routing complexity, unintended signal coupling, and resistance by increasing the number of vias connecting gate structures to conductive tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell areas are reduced and transistor density is increased to miniaturize ICs, then more transistors and circuit elements can be packed into an IC die, but routing complexity of interconnection structures becomes more complicated and challenging
Solution Approach 1:
The gate structure is segmented into multiple sections with different functional characteristics. Some sections are designed as functional gates while others are non-functional, allowing differentiated routing strategies for different segments and reducing overall routing complexity
Solution Approach 2:
The patent introduces an additional dimension to the gate structure by extending it in a direction perpendicular to the conventional gate length. This creates multiple via landing options at different positions along the extended gate, providing more routing paths and reducing routing complexity
2Manufacturing precision
If conventional gate structures are used in miniaturized ICs, then manufacturing processes remain standard, but the number of vias connecting gate structures to conductive tracks is limited, increasing resistance
Solution Approach 1:
The gate structure is divided into multiple functional and non-functional sections, each capable of providing via connections. This segmentation increases the total number of via connection points, distributing the electrical current and reducing overall resistance
Solution Approach 2:
By extending the gate structure in an additional dimension, the patent creates multiple via landing positions along the extended gate. This allows multiple vias to connect the gate to conductive tracks, reducing resistance through parallel conduction paths
3Ease of manufacture
If standard gate patterns are used, then layout design is straightforward, but layout routing flexibility is limited and unintended signal coupling increases
Solution Approach 1:
The gate structure is segmented into functional and non-functional sections, allowing different routing strategies for each segment. This provides layout routing flexibility while maintaining manufacturing simplicity through standardized segmentation patterns
Solution Approach 2:
The extended gate structure in an additional dimension provides multiple via landing options, enhancing layout routing flexibility. Designers can select from multiple connection points to optimize routing paths and minimize unintended signal coupling
Data Source
AI summary
An embodiment semiconductor structure includes a first active region and a second active region extending along a first direction, a functional gate structure and a non-functional gate structure aligned with each other and extending along a second direction, and a metallization layer over the functional gate structure and the non-functional gate structure. The metallization layer defines a first metallization region, a second metallization region, and one or two middle metallization regions between the first metallization region and the second metallization region. The functional gate structure overlaps the first metallization region and overlaps one of the one or two middle metallization regions to define an overlapped portion of the one of the one or two middle metallization regions. The overlapped portion has a space defined therein sized for a connection feature between the functional gate structure and the one of the one or two middle metallization regions.