Printing Feasibility Analysis for IC Layout Separation Directives
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Solution Overview
Problem
Current microcircuit designs face challenges in manufacturing closely packed device components due to limitations in conventional mask writers, which struggle to resolve the pitch between closely spaced parallel lines, leading to potential bridging defects and requiring complex rule-based separation techniques that can be prone to over-separation.
Innovation Solution
A printing feasibility analysis is performed to identify potential bridging defects, and separation directives are created to designate edges involved in these defects for formation using separate masks, thereby avoiding bridging defects by partitioning geometric elements into groups for double patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mask writers are used to manufacture closely packed device components, then manufacturing process simplicity is maintained, but manufacturing precision deteriorates due to inability to resolve pitch between closely spaced parallel lines
Solution Approach 1:
The patent divides the geometric elements into multiple groups based on printing feasibility analysis, creating separate masks for each group. This segmentation allows each mask to be optimized for its specific pattern, improving pitch resolution while managing overall process complexity through systematic decomposition.
Solution Approach 2:
The patent transitions from a single-mask approach to a multi-mask approach by adding the dimension of multiple patterning steps. This allows closely spaced features to be resolved by distributing them across different masks, effectively increasing the resolvable pitch beyond the limitations of a single mask writer.
2Manufacturing precision
If rule-based separation techniques are used to prevent bridging defects, then manufacturing precision is improved, but device complexity increases due to over-separation in complex designs
Solution Approach 1:
The patent implements printing feasibility analysis that provides feedback on which geometric elements can be successfully printed together. This feedback mechanism allows the system to make informed separation decisions based on actual printing outcomes rather than applying rigid rules, thereby preventing over-separation while still avoiding bridging defects.
Solution Approach 2:
The patent changes the parameter basis for separation from fixed geometric rules to dynamic printing feasibility parameters. By analyzing factors such as feature size, spacing, and pattern density, the system adapts separation decisions to the specific characteristics of each geometric element, improving precision without unnecessarily increasing complexity.
3Manufacturing precision
If double patterning is used to resolve pitch limitations, then manufacturing precision is improved, but productivity decreases due to additional manufacturing steps
Solution Approach 1:
The patent performs printing feasibility analysis and creates separation directives before the actual mask writing process. By pre-determining which elements need separate masks and organizing them into groups, the system minimizes iterations and rework during manufacturing, thereby reducing the negative impact on productivity despite the additional patterning steps.
Solution Approach 2:
The patent applies double patterning selectively only to geometric elements that fail the printing feasibility analysis, rather than applying it universally to all features. This partial application approach maintains manufacturing precision for critical features while minimizing the overall impact on productivity by leaving simpler features to be processed in fewer steps.
Data Source
AI summary
Separation directives for integrated circuit layout design data are formed based upon one or more printing feasibility analyses performed on the layout design data. At least one printing feasibility analysis is performed on layout design data to identify portions of the design that may not be correctly formed or “printed” during a photolithographic process. The geometric element edges involved in a potential printing defect are then identified as edges to be formed using separate masks. Further, separation directives may be created to specifically designate the identified edges as edges to be formed using separate masks in a photolithographic manufacturing process.