IC Thermal Decay Curve Modeling for Faster Steady-State Analysis
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Solution Overview
Problem
Conventional thermal modeling systems for data processing systems like smartphones are time-consuming due to excessive computational requirements, making it difficult to achieve detailed thermal simulation results within a practical timeframe, especially with 3D IC packaging complicating the computations.
Innovation Solution
A method for simulating dynamic thermal characterization using computational fluid dynamics (CFD) to derive thermal decay curves, distinguishing between near and far field effects, and employing a combination of linear superposition and neural networks to compute steady-state thermal profiles efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional finite element methods and computational fluid dynamics simulation tools are used to obtain detailed thermal profile, then measurement precision is improved, but productivity deteriorates due to excessive computational time
Solution Approach 1:
The patent segments the thermal simulation problem into two distinct parts: near-field thermal effects (NFEs) and far-field thermal effects (FFEs). NFEs are computed at a fine resolution using finite element methods, while FFEs are computed at a coarser resolution using computational fluid dynamics. This segmentation allows each method to be applied optimally to the region where it is most effective, reducing overall computational time while maintaining thermal profile accuracy.
Solution Approach 2:
The patent applies different computational resolutions to different spatial regions: a first (finer) resolution is used for near-field effects close to heat sources, while a second (coarser) resolution is used for far-field effects. This local quality approach ensures high accuracy where thermal gradients are steepest while reducing computational burden in regions where temperature variations are more gradual.
2Measurement precision
If 3D IC packaging is modeled with detailed computations for different levels, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the 3D IC packaging model into distinct near-field and far-field regions, allowing simplified representations for far-field effects while maintaining detailed modeling where necessary. This reduces the overall computational complexity of the 3D IC packaging model while preserving essential thermal characteristics.
Solution Approach 2:
The patent changes the resolution parameter spatially, using fine resolution for near-field effects and coarse resolution for far-field effects. This parameter variation reduces the number of computational elements required for 3D IC packaging models while maintaining accuracy in critical regions.
3Measurement precision
If conventional thermal modeling systems attempt to capture detailed thermal responses, then measurement precision is improved, but loss of time increases
Solution Approach 1:
By segmenting the thermal response into near-field and far-field components, the patent enables parallel or sequential computation of these components using appropriately scaled methods. This segmentation captures detailed thermal responses where needed while using simplified models elsewhere, significantly reducing total computational time.
Solution Approach 2:
The patent applies high-quality detailed modeling locally in near-field regions where thermal gradients are most significant, while using lower-quality coarse modeling in far-field regions. This local quality approach maintains thermal static response accuracy in critical areas while reducing overall computational time.
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
Enables rapid and accurate thermal modeling of ICs by capturing both near and far field effects, allowing for effective thermal management and reducing computational time.
Implementation Method 1
characterizing a model of an integrated circuit (IC) to derive a set of thermal decay curves which comprise a nominal steady state thermal decay curve model and a set of location dependent thermal decay curves
Implementation Method 2
computing the steady state thermal profile of the IC combines the NFEs and FFEs of all aggressors using linear superposition
Data Source
AI summary
Methods and systems for improved simulation of thermal characterization and thermal modeling of devices, such as smart phones, are described. In one embodiment, a method can characterize center, edge, and corner thermal decay behavior at different locations on a simulated IC. For each location, near and far field thermal effects are captured at the same time. A simulation system can generate a steady state thermal decay curve for each selected location that shows how the temperature changes with distance to a heat source. The system can then use a set of location dependent thermal decay curves to compute, based on an inputted power profile for the IC, a steady state thermal profile of the IC.