Gallium nitride-based devices and methods of testing thereof
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Solution Overview
Problem
Current GaN-based integrated circuits face challenges in detecting and identifying defects in both high-voltage and low-voltage circuits due to lattice mismatch, thermal expansion mismatch, impurities, and tilt boundaries, which affect the quality and reliability of the devices and are not efficiently addressed by existing techniques.
Innovation Solution
The integration of test terminals connected to both high-voltage and low-voltage circuits allows for the detection and identification of defects through independent test signals, enabling the identification of epitaxial, surface, and gate defects while minimizing leakage current and preventing damage to low-voltage circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silicon-based devices are used for power applications, then device performance is close to theoretical limits, but improvements in key parameters have leveled off
Solution Approach 1:
The patent transitions from silicon-based materials to gallium nitride (GaN) based materials, fundamentally changing the material parameter to achieve higher breakdown voltages, lower on-resistance, and improved switching speeds. This material parameter change enables power devices to exceed the theoretical limits of silicon-based technology.
2Ease of operation
If GaN-based integrated circuits are tested with unified test signals, then testing is simplified, but defects in high-voltage and low-voltage circuits cannot be independently identified
Solution Approach 1:
The patent segments the test signal application by providing separate first test terminals for high-voltage circuits and separate second test terminals for low-voltage circuits. This allows independent test signals to be applied to each circuit type, enabling precise identification of defects specific to high-voltage or low-voltage portions without interference between the two circuit types.
Solution Approach 2:
The patent applies different test signal characteristics to different circuit portions - high-voltage test signals with appropriate voltage levels and waveforms for stress testing high-voltage devices, and low-voltage test signals optimized for low-voltage circuit characterization. This local optimization of test signal quality enables accurate defect identification in each circuit type.
3Measurement precision
If high-voltage test signals are applied to GaN circuits, then high-voltage defect detection is improved, but low-voltage circuits may be damaged
Solution Approach 1:
The patent physically segments the test terminal connections by providing dedicated first test terminals connected only to high-voltage circuits and dedicated second test terminals connected only to low-voltage circuits. This segmentation ensures that high-voltage test signals applied through first test terminals cannot reach low-voltage circuits, eliminating the harmful effect while maintaining high-voltage defect detection capability.
Solution Approach 2:
The patent introduces isolated test terminals as intermediaries between the test signal source and the circuits under test. These test terminals provide electrical isolation and appropriate signal level matching, allowing high-voltage test signals to be applied to high-voltage circuits without directly exposing low-voltage circuits to damaging voltage levels.
4Measurement precision
If separate test terminals are provided for high-voltage and low-voltage circuits, then defect identification is improved, but device complexity increases
Solution Approach 1:
The patent designs the test terminal structure to serve multiple functions: first test terminals simultaneously provide high-voltage signal application, high-voltage defect detection, and electrical isolation for low-voltage circuits; second test terminals similarly serve low-voltage signal application and detection. This multi-functionality reduces the need for additional separate components, managing overall device complexity while maintaining enhanced defect detection capability.
Data Source
AI summary
An integrated circuit includes a first circuit, formed based on one or more Group III-V compound materials, that is configured to operate with a first voltage range. The integrated circuit includes a second circuit, also formed based on the one or more Group III-V compound materials, that is operatively coupled to the first circuit and configured to operate with a second voltage range, wherein the second voltage range is substantially higher than the first voltage range. The integrated circuit includes a set of first test terminals connected to the first circuit. The integrated circuit includes a set of second test terminals connected to the second circuit. Test signals applied to the set of first test terminals and to the set of second test terminals, respectively, are independent from each other.