Localized Self-Heating Analysis for Integrated Circuit Cells
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Solution Overview
Problem
Current IC design methods fail to accurately and efficiently analyze localized self-heating (DeltaT) within integrated circuits during the gate level design phase, which can lead to issues like leakage currents, circuit delays, and fabrication reliability problems.
Innovation Solution
A computer-implemented method that models power and thermal resistance characteristics for each location within a cell, performs self-heating analysis to determine heat amounts, and creates thermal profiles including maximum and average self-heating values, enabling an accurate and rapid in-context analysis of self-heating heterogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional self-heating analysis methods are used, then the analysis can be performed, but the analysis is inaccurate and inefficient during the gate level design phase
Solution Approach 1:
The patent divides the IC cell into multiple discrete locations (e.g., transistor-level or region-level zones) and performs self-heating analysis at each segmented location individually. This segmentation enables accurate capture of localized thermal heterogeneity while maintaining computational efficiency by processing each location independently rather than requiring a full-cell thermal simulation.
Solution Approach 2:
The patent assigns location-specific thermal resistance characteristics and power consumption models to each discrete location within the cell, rather than using uniform cell-level parameters. This local quality approach allows the analysis to accurately reflect the unique thermal properties of different regions (e.g., active transistors vs. passive regions) while keeping the overall analysis computationally tractable.
2Measurement precision
If detailed thermal analysis is performed to capture self-heating heterogeneity, then measurement precision improves, but the analysis time increases
Solution Approach 1:
The patent pre-characterizes thermal resistance characteristics and power consumption models for various cell locations and transistor types before the actual design analysis. These pre-computed lookup tables or models can be quickly queried during the design process, eliminating the need for time-consuming real-time thermal simulations while maintaining high measurement precision for thermal profiling.
3Reliability
If comprehensive thermal analysis is performed early in the design process, then design revisions can be made sooner, but the complexity of the analysis increases
Solution Approach 1:
The patent uses simplified analytical models and lookup tables that replicate the essential thermal behavior of IC locations without requiring complex physical simulations. These simplified copies of thermal characteristics can be quickly queried and applied during design reviews, enabling early reliability assessment while keeping the analysis system relatively simple and easy to implement.
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 allows for efficient and early identification of localized hot spots, enabling design revisions to improve heat dissipation, thereby enhancing IC reliability and reducing turnaround time in the design process.
Implementation Method 1
the switching of transistors designed into the IC consumes electrical power, which generates heat that causes a rise in the temperature at various locations ('hot spots') within the IC
Implementation Method 2
modeling, by a processor, a power characteristic and a thermal resistance characteristic for each one of a plurality of locations within a cell
Data Source
AI summary
Aspects of the present invention include a method, system and computer program product that provides for improved localized self-heating analysis during IC design. The method includes a processor for modeling a power characteristic and a thermal resistance characteristic for each one of a plurality of locations within a cell that is being designed into an integrated circuit; for performing a self-heating analysis to determine an amount of heat at each one of the plurality of locations within the cell; and for creating a thermal profile for the cell, wherein the thermal profile includes a maximum self-heating value for each of the plurality of locations within the cell and includes an average self-heating value for the cell, and wherein the maximum self-heating value and the average self-heating value are derived from the determined amount of heat at each one of the plurality of locations within the cell.