Thermal Stack-Up Analysis for Pinpointing Failing Interface Layers
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Solution Overview
Problem
Thermal resistance measurement in semiconductor chips is complex and time-consuming, and identifying the source of thermal failures within chip packages is difficult, leading to inefficiencies in manufacturing and customer satisfaction issues.
Innovation Solution
A method and system for thermal analysis that determines R deviation percentage thresholds for each thermal interface layer, calculates R deviation, and identifies thermal failure parameters by comparing measured time parameters to gold values, allowing precise identification of failing thermal interface layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional thermal resistance measurement methods are used, then thermal parameters can be obtained, but the measurement process becomes time-consuming and complex as semiconductors become more tightly packed with components
Solution Approach 1:
The patent segments the thermal interface layer into multiple discrete thermal interface layers (first, second, third thermal interface layers), each with its own thermal resistance measurement. This segmentation allows individual identification and measurement of each interface layer's thermal properties, enabling precise localization of thermal failures without requiring complex overall package measurements.
2Loss of information
If traditional thermal measurement methods are used, then thermal resistance data can be collected, but the ability to diagnose the specific source of thermal failures deteriorates
Solution Approach 1:
The patent divides the chip package into distinct thermal interface layers (first, second, third thermal interface layers between processor, I/O board, and memory board respectively), measuring thermal resistance across each segment individually. This segmentation provides detailed diagnostic information about which specific interface layer is causing thermal failures, rather than only providing overall package thermal data.
Solution Approach 2:
The patent introduces a vertical dimensional breakdown of thermal resistance measurements through multiple interface layers stacked between different boards. By measuring thermal resistance across each vertical interface layer separately (processor-to-I/O, I/O-to-memory, etc.), the system gains dimensional resolution in diagnosing thermal paths, identifying which specific layer in the stack is problematic.
3Reliability
If detailed thermal measurements of each interface layer are performed, then thermal failure diagnosis is improved, but the complexity of the testing system increases
Solution Approach 1:
The patent employs a universal thermal measurement approach where a single testing system performs multiple functions: measuring thermal resistance across all interface layers, identifying specific failing layers, and providing diagnostic information. The same measurement infrastructure is used to characterize the processor, I/O board, and memory board thermal interfaces, reducing the need for separate specialized testing equipment for each layer.
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
Enhances the ability to pinpoint thermal failures in chip packages, improving manufacturing efficiency and customer satisfaction by isolating the specific thermal interface layer causing issues, thereby reducing thermal shutdowns and enhancing yield.
Implementation Method 1
the processor is coupled to the I/O board through a first thermal interface layer and coupled to the memory board through a second thermal interface layer
Data Source
AI summary
Testing chip or board packages for thermal failure can be conducted at various stages of the package's life cycle. Conventional testing can detect a thermal failure of the package, though conventional testing does not detect at which specific thermal layer a failure has occurred. By applying an R deviation percentage to the measured thermal parameters received from a testing unit, a specific breakdown of each thermal interface layer can be analyzed. Each thermal interface layer has an associated gold value which is a known good value of thermal energy at a specific time interval. The gold value can be compared to the timing results calculated from the measured thermal parameters. This comparison can then identify which thermal interface layers, if any, are causing the thermal failure of the package. The thermal interface layer can then be repaired or the manufacturing process can be modified to eliminate the failure.