IC Layout Matching Zones for Pattern Consistency Checks
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Solution Overview
Problem
The miniaturization of integrated circuits (ICs) has led to stricter layout design restrictions, necessitating efficient methods for optimizing the placement of predesigned cells and routing while ensuring uniformity in electric properties and geometric matching between device elements, which existing technologies struggle to address effectively.
Innovation Solution
The layout design of ICs is divided into multiple matching zones with varying sets of matching rules, and a layout-versus-layout comparison process is employed using symmetry operations to check for layout pattern consistency and detect defects, thereby improving the efficiency of design rule checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the layout design is divided into multiple matching zones with different sets of matching rules, then the manufacturing precision and uniformity of electric properties are improved, but the device complexity and difficulty of detecting and measuring increase
Solution Approach 1:
The layout design is divided into multiple matching zones (first matching zone, second matching zone, etc.), each with its own set of matching rules. This segmentation allows different regions to have customized matching criteria appropriate to their specific requirements, thereby improving manufacturing precision without requiring a single complex rule set to cover all cases.
Solution Approach 2:
Each matching zone is assigned a specific set of matching rules tailored to its local requirements. The first matching zone has a first set of matching rules, while the second matching zone has a second set of matching rules. This local customization ensures that each region's specific manufacturing precision requirements are met without imposing unnecessary complexity on other regions.
2Measurement precision
If a layout-versus-layout comparison process using symmetry operations is employed, then the measurement precision and detection efficiency are improved, but the computing time and operational complexity increase
Solution Approach 1:
The layout design is pre-divided into multiple matching zones with defined matching rules before the comparison process begins. This preliminary organization allows the subsequent layout-versus-layout comparison to proceed more efficiently by only comparing relevant patterns within each zone, rather than performing exhaustive comparisons across the entire layout, thus reducing computing time while maintaining detection precision.
Solution Approach 2:
The matching rules for different zones are adjusted based on local requirements, allowing the comparison process to focus on critical parameters for each zone. This parameter customization enables more efficient detection by concentrating computational resources on the most important layout consistency checks for each matching zone.
Data Source
AI summary
A method includes finding repeated layout patterns at least in a part of a layout design of an integrated circuit, identifying multiple layout units from the repeated layout patterns, and separating the layout design into multiple matching zones. At least two of the matching zones have different sets of matching rules. Each of the multiple layout units is in a first matching zone. The method also includes comparing a first layout unit with a second layout unit, and checking layout pattern consistency between the first layout unit and the second layout unit.