Automated Signal Electromigration Analysis with State-Transition Weighting
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Solution Overview
Problem
Existing integrated circuit design and fabrication processes face challenges in effectively addressing signal electromigration, which can lead to vacancies and deposits within wires and gates due to current flow, necessitating improved analysis and optimization methods.
Innovation Solution
A computer-implemented method for signal electromigration analysis involving the production of a state-analysis-based transition matrix, definition of transition submatrices, determination of per simulation weighting factors, and application of these factors to electrical current data from timing simulations to assess and modify logic circuit designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal electromigration analysis is performed using traditional methods, then electromigration faults can be detected, but the analysis process is time-consuming and computationally intensive
Solution Approach 1:
The patent segments the logic circuit design into multiple simulation regions or blocks, allowing parallel processing of electromigration analysis across different segments. This divides the large-scale computationally intensive analysis into smaller, manageable units that can be processed simultaneously, reducing overall analysis time while maintaining detection accuracy.
Solution Approach 2:
The patent transforms the electromigration analysis by changing parameters from traditional transient simulation approaches to a state-transition based method using Markov chains. This parameter change allows the analysis to capture electromigration effects through state transitions rather than continuous time simulation, significantly reducing computational requirements and analysis time.
2Measurement precision
If detailed transient simulation is used for electromigration analysis, then accurate current data can be obtained, but the computational complexity increases
Solution Approach 1:
The patent replaces the mechanical transient simulation system with a mathematical state-transition model. Instead of performing time-consuming transient simulations to obtain current data, the system uses Markov chain state transitions to model circuit behavior and derive equivalent current information, reducing computational complexity while maintaining accuracy.
Solution Approach 2:
The patent creates simplified copies or representations of the actual circuit behavior through state-transition models. These models capture the essential electrical characteristics and current flow patterns without requiring full transient simulation, providing accurate enough data for electromigration analysis with reduced computational burden.
3Reliability
If manual circuit design modification is performed to address electromigration issues, then design optimization can be achieved, but the process lacks automation and efficiency
Solution Approach 1:
The patent implements a self-service system where the electromigration analysis tool automatically generates design modifications without requiring manual intervention. The system performs the complete workflow from analysis to optimization suggestion automatically, allowing the design process to serve itself and eliminating the need for manual circuit redesign while maintaining optimization quality.
Solution Approach 2:
The patent establishes a feedback loop where electromigration analysis results directly inform design modification decisions. The system continuously monitors electromigration risks, automatically generates optimization suggestions, and can iterate on design improvements based on analyzed performance, creating an automated feedback-driven optimization process.
Data Source
AI summary
Signal electromigration analysis is performed on a logic circuit design by producing a state-analysis-based transition matrix using state analysis data for the logic circuit design, and defining transition submatrices by partitioning the transition matrix. In addition, performing signal electromigration analysis includes determining per simulation weighting factors for the signal electromigration analysis using the transition submatrices and switching factor data, and applying the determined per simulation weighting factors to weight, for signal electromigration analysis, electrical current data collected from a plurality of timing simulations of a transient simulator for the logic circuit design. In addition, performing the signal electromigration analysis includes using the weighted electrical current data in assessing signal electromigration impact on circuit performance of the logic circuit design, and based on the assessing of the circuit performance, the process further includes facilitating generating a modified logic circuit design through modifying of the logic circuit design.