Integrated Circuit Self-Heating Simulation via Segmented Thermal Analysis
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Solution Overview
Problem
As integrated circuits scale down, self-heating effects become significant due to confined heat dissipation, impacting electrical characteristics and device reliability, necessitating an accurate and efficient simulation method to account for these effects.
Innovation Solution
A two-step simulation process where the first simulation calculates average temperature changes over a time period, and these values are used in a second simulation to incorporate self-heating effects, reducing simulation time and improving convergence by avoiding the need to simulate temperature change at every time point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If simulation includes temperature change at every time point, then accuracy is improved, but simulation time increases significantly
Solution Approach 1:
The simulation process is divided into two separate steps: first performing electrical simulation to obtain power dissipation, then performing thermal simulation using the calculated average temperature changes. This segmentation allows each simulation to focus on specific aspects rather than simultaneously tracking all parameters at every time point, thereby reducing overall simulation time while maintaining accuracy.
Solution Approach 2:
The electrical simulation is performed first to calculate average temperature changes over the simulation period before the actual thermal simulation. This preliminary action provides the necessary thermal data in advance, allowing the second simulation to incorporate self-heating effects without needing to recalculate temperature at every time point during the main simulation.
2Productivity
If device size is scaled down, then production efficiency is improved, but self-heating effect increases
Solution Approach 1:
Average temperature changes calculated from electrical simulation serve as an intermediary parameter that bridges the electrical and thermal domains. This intermediary allows the simulation to account for self-heating effects in scaled-down devices without directly modeling the complex thermal physics at every time point, thus managing temperature effects efficiently.
Solution Approach 2:
The simulation incorporates temperature as a dynamic parameter by calculating average temperature changes over the simulation period and applying them to adjust device characteristics. This parameter change approach allows the model to reflect self-heating effects in scaled-down devices where temperature increases are more significant, without requiring continuous temperature monitoring.
3Measurement precision
If self-heating effect is incorporated, then simulation accuracy is improved, but computational complexity increases
Solution Approach 1:
The complex task of incorporating self-heating effects is segmented into two separate simulation processes: electrical simulation to determine power dissipation and thermal simulation to calculate temperature changes. This segmentation reduces the computational complexity of each individual simulation compared to a fully coupled approach that would require solving both electrical and thermal equations simultaneously at every time point.
Solution Approach 2:
The patent applies partial action by calculating average temperature changes over the entire simulation period rather than tracking temperature at every instantaneous time point. This partial approach provides sufficient accuracy for capturing self-heating effects while significantly reducing the computational complexity compared to a complete time-resolved thermal simulation.
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 reduces simulation time and improves convergence, providing accurate results by separately calculating and incorporating average temperature changes to emulate self-heating effects, thus addressing the challenges of scaling down in integrated circuits.
Implementation Method 1
self-generated heat of some devices can be confined in a small volume, thus the self-generated heat can affect the device temperature
Data Source
AI summary
A method includes receiving input information related to devices of an integrated circuit. A first simulation of the integrated circuit is performed over a first time period. Average temperature changes of the devices over the first time period are calculated. A second simulation of the integrated circuit is performed over a second time period using the average temperature changes of the devices. The first simulation and the second simulation are executed by a processor unit.