Pattern-Driven Routing for Lithographic Issue Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical lithography technologies face challenges in accurately accounting for lithographic effects in integrated circuit design, leading to complex design rules and difficulties in predicting interactions between multiple objects, which limits the ability of rule-driven routing to handle these issues effectively.
Innovation Solution
Pattern-driven routing utilizes pattern matching to identify and address lithographic issues by comparing initial routing solutions with known patterns stored in a routing pattern library, allowing for the identification and correction of lithographic problems without relying solely on design rule checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical lithography is used with traditional design rules, then the manufacturing process is simple, but the manufacturing precision deteriorates due to lithographic effects on sub-wavelength features
Solution Approach 1:
The patent replaces the mechanical rule-based verification system with an optical simulation system. Instead of using complex design rules to predict lithographic effects, the system directly simulates the optical lithography process using computational models that calculate light interference and diffraction patterns, thereby substituting mechanical rule-checking with optical field simulation to achieve higher precision without proportionally increasing rule complexity
Solution Approach 2:
The patent changes the fundamental parameters used for verification from geometric design rules to optical field parameters. Instead of checking spacing and dimensions against fixed rules, the system transforms the verification parameters to include light intensity distributions, interference patterns, and optical proximity effects, allowing accurate prediction of lithographic outcomes based on physical optical properties rather than simplified geometric constraints
2Manufacturing precision
If design rules are expanded to account for lithographic effects, then the manufacturing precision improves, but the ease of operation deteriorates due to difficulty in creating and applying comprehensive rules
Solution Approach 1:
The patent implements a self-service system where the optical simulation engine automatically performs lithographic verification and generates routing recommendations without requiring manual rule creation or interpretation. The system self-evaluates routing designs by simulating optical effects and automatically identifies patterns that may cause lithographic defects, eliminating the need for operators to manually apply complex expanded design rules while maintaining high precision
Solution Approach 2:
The patent introduces a feedback mechanism where the optical simulation results are fed back into the routing process. The system simulates lithographic effects on proposed routing patterns, compares the results against acceptable thresholds, and automatically adjusts or flags problematic patterns. This closed-loop feedback system maintains manufacturing precision by continuously verifying designs against actual optical behavior while keeping operations simple through automated iterative optimization
3Manufacturing precision
If simulation is incorporated into the routing process, then the manufacturing precision improves by accurately predicting lithographic effects, but the productivity deteriorates due to increased computation time
Solution Approach 1:
The patent performs preliminary optical simulations during the routing design phase rather than after completion. By integrating optical verification into the routing process itself, the system identifies and corrects lithographic issues as they are being designed, preventing the need for time-consuming post-processing simulations and iterative corrections, thereby maintaining high precision while improving overall productivity
Solution Approach 2:
The patent segments the routing design into multiple phases, with optical simulation applied at specific critical stages rather than continuously. The system divides the routing process into segments where full optical simulation is performed only when necessary (e.g., when critical patterns are detected or at key decision points), while other segments use faster approximation methods or simplified checks, balancing precision requirements with computational efficiency to maintain productivity
4Manufacturing precision
If the number of design rules increases to cover all object combinations, then the manufacturing precision improves, but the device complexity increases making it difficult for routers to honor all rules
Solution Approach 1:
The patent replaces the complex mechanical rule-based routing system with an optical field-based simulation system. Instead of implementing numerous discrete design rules for different object combinations, the system uses continuous optical field simulations that naturally account for all interactions between objects through physical light propagation models, thereby achieving comprehensive precision coverage without the combinatorial explosion of rules that would overwhelm the routing system
Data Source
AI summary
A method and system for pattern-driven routing are disclosed. Embodiments of pattern-driven routing are disclosed for creating a representation for at least a portion of an initial routing solution, comparing the representation for at least the portion of the initial routing solution with a pattern, and determining whether the initial routing solution has lithographic issues based on the comparison.