Mask Layout Block Electromigration and Self-Heat Violation Prevention
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Solution Overview
Problem
Current methods for integrated circuit design fail to effectively prevent electromigration and self-heating issues during the construction of mask layout blocks, leading to potential device failures and inefficiencies in the design process, as they often require wider conductor widths or maximum temperature limits that waste space and are difficult to detect until failures occur.
Innovation Solution
The implementation of a system and method that automatically prevents the placement or editing of polygons in a mask layout block if electromigration and self-heating rule violations are identified, using a nanoGeo Engine and EMSH Aware tool to analyze and correct violations in real-time, ensuring process design rules and layout connectivity are maintained, thereby reducing design time and preventing electromigration and self-heating problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wider conductor widths are used throughout the IC wiring network to control electromigration, then electromigration reliability is improved, but valuable space on the IC device is wasted
Solution Approach 1:
The patent applies local quality by implementing electromigration control only in specific segments of the IC wiring network where high current density exists, rather than uniformly across the entire network. The system identifies critical segments experiencing electromigration stress and applies wider conductor widths or alternative configurations only to those localized areas, thereby maintaining reliability where needed while preserving space in non-critical regions.
Solution Approach 2:
The patent segments the IC wiring network into distinct regions based on current density and electromigration risk. By dividing the network into high-risk and low-risk segments, the system can apply different design strategies to each segment, using enhanced electromigration protection only where necessary and standard designs elsewhere, thus optimizing the balance between reliability and space utilization.
2Reliability
If maximum temperature limits are imposed on conductors with alternating current flow to prevent electromigration, then electromigration reliability is improved, but design complexity and space requirements increase
Solution Approach 1:
The patent implements feedback mechanisms that continuously monitor temperature and current density in conductors with alternating current flow. The system uses this feedback information to dynamically adjust design parameters and identify violations, enabling precise control of electromigration risks without requiring overly complex preventive structures. The feedback loop allows the design tool to automatically detect and flag potential electromigration issues based on actual thermal and electrical conditions.
3Reliability
If electromigration and self-heating checks are performed manually after layout construction, then design reliability can be verified, but significant design time is consumed
Solution Approach 1:
The patent applies preliminary action by integrating electromigration and self-heating analysis capabilities directly into the layout construction process. The design tool performs real-time checks as the layout is being created, identifying potential violations during the design phase rather than requiring separate post-processing steps. This preliminary detection and correction approach eliminates the need for time-consuming manual verification cycles after layout completion.
Solution Approach 2:
The patent enables self-service by implementing automated detection and correction mechanisms that operate independently without requiring manual intervention. The design tool automatically identifies electromigration and self-heating violations, provides diagnostic information, and suggests or applies corrections directly within the layout construction environment, thereby eliminating the need for separate manual verification and correction processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces design time by up to 40% and ensures reliable integrated circuit operation by preventing electromigration and self-heating issues early in the design phase, maintaining DRC Clean and LVS Clean correctness, and avoiding costly re-spins and time-consuming reliability verification processes.
Implementation Method 1
The electron movement induced by the current in the metal power lines causes metal ions to migrate. That phenomenon of transport of mass in the path of a DC flow, as in the metal power lines in the design, is termed power electromigration.
Implementation Method 2
conductors with alternating current flow do use power and generate heat. Since EM is very sensitive to the temperature of the conductors, it is often necessary to limit the temperature increase of the conductors in IC devices that results from the heating due to alternating current flow.
Data Source
AI summary
Computer-implemented systems and methods for improving construction of a mask layout block, for eliminating electromigration and self-heat violations during construction of a mask layout block, and for maintaining process design rules and layout connectivity during construction of a mask layout block are provided. At least one selected polygon is analyzed and a selected position of the selected polygon determined. The systems and methods obtain one or more electromigration rules or self-heat rules associated with the selected polygon. An information window with the one or more electromigration or self-heat rules and a violation marker associated with the selected position of the selected polygon are provided. The system determines if the selected position of the selected polygon or a length or width of the selected polygon violates an electromigration rule or self-heat rule. The violation marker prevents creating, placing, and editing the selected polygon if the selected position would violate at least one of the one or more electromigration rules or self-heat rules.