Thermal Imaging for Integrated Circuit Anomaly Detection
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Solution Overview
Problem
Conventional testing methods for integrated circuits and FPGAs are insufficient in detecting unexpected or unintended circuitry changes, as they primarily focus on input/output associations and may miss abnormalities that do not alter normal functionality, such as additional or missing circuitry.
Innovation Solution
The method involves using thermal imaging to supplement existing testing techniques by selecting and applying test vectors to activate circuit portions, detecting thermal changes, and comparing them with expected activations to identify any unexpected activity, thereby detecting additional or missing circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional testing methods (ATPG, JTAG, functional test vectors) are used to verify electrical functionality, then input/output associations are validated, but unexpected circuitry changes (additional or missing circuitry) are not detected
Solution Approach 1:
The patent replaces conventional electrical testing methods with thermal imaging technology. Instead of applying electrical test vectors and measuring electrical outputs, the system applies test vectors and detects thermal patterns generated by activated circuitry. This substitution enables detection of unexpected circuitry changes because thermal imaging reveals the physical presence and activation state of circuit elements regardless of their electrical I/O behavior.
Solution Approach 2:
The patent changes the measurement parameter from electrical output signals to thermal patterns. By monitoring temperature changes and thermal radiation from the circuit under test, the system can identify activated portions of circuitry. This parameter change allows detection of circuit abnormalities that do not manifest in electrical I/O behavior, as thermal patterns directly reflect the physical activation state of circuit elements.
2Loss of information
If thermal imaging is used to detect activated portions of circuitry, then detailed test information is obtained, but testing complexity increases
Solution Approach 1:
The patent employs a thermal imaging system that serves multiple functions: it detects activated circuit portions, identifies unexpected circuitry changes, validates circuit functionality, and provides detailed test information. By using a single thermal imaging approach for multiple testing objectives, the system reduces overall testing complexity compared to employing separate specialized tools for each function.
Solution Approach 2:
The patent introduces thermal imaging as an intermediary between test vector application and result analysis. The thermal camera acts as a mediator that translates circuit activation states into visible thermal patterns, which can then be analyzed to detect various types of circuit abnormalities. This intermediary approach simplifies the testing process by providing a unified detection mechanism that captures comprehensive circuit behavior.
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 provides more detailed test information, enabling the detection of intentional or unintentional changes in circuitry that conventional methods might miss, ensuring manufactured devices contain only intended circuitry and functionality.
Implementation Method 1
detecting activated portions of the second electrical circuit over time by identifying thermal changes in the second electrical circuit during application of the test vectors
Data Source
AI summary
A method of testing an electrical circuit includes applying test vectors to a circuit, detecting thermal changes in portions of the circuit during application of the test vectors, and identifying unexpected activity corresponding to the thermal changes. The method supplements standard testing techniques to provide a new method of assessing operation of fabricated integrated circuits and programmed field programmable gate arrays.