3D IC Thermography Calibration Using Multi-Height Test Structures
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Solution Overview
Problem
Conventional three-dimensional thermography fault isolation tools for 3-D IC devices are inaccurate in identifying the component to which a fault belongs due to variability in material parameters and close proximity of components, leading to misidentification of fault locations.
Innovation Solution
A test structure and method for calibrating three-dimensional thermography fault isolation tools using heat generating test components at different heights and locations, allowing for accurate determination of time differences to accurately identify fault components, which are then used to calibrate the tool, ensuring it accounts for device parameter variability similar to the actual 3-D IC devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a theoretical thermal behavior model is used to identify fault components, then the fault isolation process is simplified, but the identification accuracy deteriorates due to variability in material parameters and close proximity of components
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing reference thermal behavior data for each component in the 3-D IC device before actual fault detection. During calibration, the system pre-processes thermal responses from multiple test components at different locations and depths, creating a reference database that accounts for material parameter variability. This pre-computation enables faster and more accurate fault identification during actual operation without requiring complex real-time calculations.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying test parameters such as voltage levels, pulse durations, and measurement time points during calibration. By changing these parameters and observing how thermal responses vary, the system builds a comprehensive reference model that captures the range of possible thermal behaviors. This allows the fault isolation tool to accurately identify components even when material parameters vary from theoretical values.
2Ease of manufacture
If theoretical model parameters are used for calibration, then the calibration process is simpler, but the tool cannot account for actual device parameter variability
Solution Approach 1:
The patent applies self-service by using the 3-D IC device itself as the calibration reference. Instead of relying on external theoretical models or separate calibration standards, the system performs calibration directly on the device under test by measuring thermal responses from known good components within the device. This self-calibration approach automatically accounts for the device's actual material parameters, manufacturing variations, and specific thermal characteristics, ensuring high reliability without requiring separate calibration processes.
3Measurement precision
If multiple test components at different heights are used for calibration, then the accuracy of fault isolation improves, but the calibration process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the calibration process into distinct stages: selecting test components at different vertical positions, applying voltage pulses to each component separately, measuring thermal responses independently, and storing results in organized reference data structures. This segmented approach breaks down the complex multi-component calibration into manageable steps, making the process systematic and automated rather than overwhelming.
Solution Approach 2:
The patent uses an intermediary processing layer that automatically handles the complexity of multi-component calibration. This intermediary system manages the coordination of voltage applications, thermal measurements, and data processing across multiple test components. It transforms the complex raw data from multiple components into organized reference thermal behavior profiles, shielding the user from the underlying complexity while maintaining high calibration accuracy.
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
The calibration method significantly improves the accuracy of fault isolation in 3-D IC devices by using actual device parameter variability, reducing reliance on theoretical models and enhancing the tool's ability to correctly identify fault components, thus facilitating efficient fault correction.
Implementation Method 1
a first heat generating test component at the first semiconductor die... configured to produce a first temperature change in response to a voltage applied
Implementation Method 2
The temperature change may be captured an infrared (IR) camera positioned facing the 3-D IC device
Data Source
AI summary
An apparatus for calibrating a three-dimensional thermography fault isolation tool, includes: a substrate having two or more pins; a first semiconductor die coupled to the substrate; a first heat generating test component at the first semiconductor die; and a second heat generating test component, wherein the first heat generating test component and the second heat generating test component are located at different respective heights; wherein the first heat generating test component is configured to produce a first temperature change in response to a voltage applied by the three-dimensional thermography fault isolation tool to the two or more pins; and wherein the second heat generating test component is configured to produce a second temperature change in response to the voltage or another voltage applied by the three-dimensional thermography fault isolation tool.