IC Layout Spacing Detection for Etch Accuracy
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Solution Overview
Problem
The complexity of small trench lengths in DRAM manufacturing leads to etch errors, making it difficult to achieve uniformity and precision in integrated circuit layouts, resulting in inefficiencies and prolonged development cycles.
Innovation Solution
A layout method and apparatus that automatically detect and mark spacing regions between element regions to ensure they meet a minimum width requirement for dummy pattern filling, improving etch accuracy and allowing for quicker adjustments in the layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pseudo-gates are manually added to compensate for etch errors in small trench lengths, then etch accuracy is improved, but layout complexity and time consumption increase significantly
Solution Approach 1:
The layout apparatus automatically detects spacing regions and adds dummy patterns without human intervention. The system performs self-service by autonomously identifying regions requiring dummy patterns and executing the addition, eliminating the need for manual engineer intervention while maintaining etch accuracy compensation
Solution Approach 2:
The patent replaces the manual mechanical process of adding pseudo-gates with an automated computational system. The layout apparatus uses algorithms to detect spacing regions and automatically generates dummy patterns, substituting human manual operations with automated electronic design automation (EDA) processes
2Manufacturing precision
If engineers manually add pseudo-gates to improve photolithography quality, then layout precision is improved, but development cycle time increases
Solution Approach 1:
The layout apparatus performs preliminary detection of spacing regions and automatically adds dummy patterns during the layout design phase. By proactively identifying and addressing spacing issues before manufacturing, the system eliminates the need for time-consuming manual adjustments and extends the benefits to subsequent photolithography processes
Solution Approach 2:
The automated system performs self-service by autonomously detecting spacing regions and adding dummy patterns without requiring engineer intervention. This self-service capability dramatically reduces the time needed to improve layout precision while maintaining high-quality results
3Productivity
If the number of transistors with small trench lengths is increased, then circuit functionality is improved, but etch error probability increases
Solution Approach 1:
Dummy patterns serve as intermediary elements between adjacent element regions with small trench lengths. These intermediary dummy patterns create appropriate spacing that prevents etch errors while allowing the circuit to maintain its high transistor density and functionality
Solution Approach 2:
The patent applies local quality by adding dummy patterns only in specific spacing regions where etch errors are likely to occur, rather than uniformly modifying the entire layout. This localized approach maintains circuit functionality while targeting specific reliability issues
Data Source
AI summary
A layout method for an integrated circuit includes the following steps: providing a layout, the layout including a first element region and a second element region, a spacing region being provided between the first element region and the second element region; and detecting whether a width of the spacing region is less than a preset width, and if yes, marking at least one of the first element region, the second element region and the spacing region, the preset width being a minimum width meeting a requirement, wherein the requirement is to fill the spacing region with at least one dummy pattern. A layout apparatus employing the layout method for the integrated circuit can quickly and accurately position a poorly-placed element region in the layout, improve the layout efficiency and layout precision of the integrated circuit, and lay a foundation for improving photolithography quality.