IC Timing Margin Measurement for Aging Failure Prediction
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Solution Overview
Problem
Integrated circuits (ICs) face challenges in predicting and preventing failures due to aging mechanisms such as hot-carrier injection, bias temperature instability, oxide breakdown, electromigration, and stress migration, which can lead to decreased performance and catastrophic failures.
Innovation Solution
A method for testing semiconductor ICs involves performing structural tests by scanning test patterns into internal circuits and measuring a margin based on the comparison between a test signal path and a delayed signal path. This method uses a margin measurement sensor to identify a delay time threshold and predict potential failures by tracking changes in timing delays over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If structural tests are performed by scanning test patterns into internal circuits, then manufacturing precision and defect detection are improved, but the ability to predict future failures due to aging mechanisms is insufficient
Solution Approach 1:
The patent implements preliminary action by measuring timing margins during initial structural testing and storing these baseline values. These preliminary measurements enable future comparison to detect aging-induced performance degradation before catastrophic failure occurs, transforming routine manufacturing testing into a predictive reliability tool.
Solution Approach 2:
The patent establishes feedback by continuously comparing current timing margin measurements against baseline values stored from initial testing. This feedback mechanism detects drift caused by aging mechanisms (hot-carrier injection, electromigration, etc.) and triggers alerts when thresholds are exceeded, enabling predictive maintenance before failure.
2Reliability
If timing margins are measured during structural testing, then reliability through failure prediction is improved, but device complexity increases due to additional measurement circuits
Solution Approach 1:
The patent applies universality by designing timing margin measurement circuits that operate during existing structural test modes without requiring separate dedicated test equipment. The same test infrastructure used for manufacturing defect detection is leveraged to perform reliability assessments, eliminating the need for additional complex measurement systems.
Solution Approach 2:
The patent implements self-service by integrating margin measurement functionality directly into the IC's existing test infrastructure. The device uses its own internal circuits and test patterns to perform self-diagnosis of timing margin degradation, eliminating the need for external complex measurement equipment and reducing overall system complexity.
3Duration of action of stationary object
If baseline timing margins are stored and compared over time, then duration of action through lifespan extension is improved, but loss of time for measurement and data management increases
Solution Approach 1:
The patent applies periodic action by scheduling margin measurements to coincide with routine structural test intervals during manufacturing and periodic field testing. This periodic approach captures aging trends without requiring continuous monitoring, minimizing measurement overhead while still detecting degradation before failure.
Solution Approach 2:
The patent uses preliminary action by establishing baseline timing margin values during initial manufacturing testing. These pre-stored baselines eliminate the need for repeated complex reference measurements, reducing subsequent measurement time and enabling rapid periodic comparisons to detect aging-induced changes.
Data Source
AI summary
Structural testing of a semiconductor integrated circuit (IC), including scanning test patterns or test conditions into internal circuits of the semiconductor IC, for example from a tester device. A timing margin may be measured during the structural test. The margin is measured based on a characteristic of a comparison between a test signal path of the semiconductor IC and a delayed signal path, the delayed signal path being a signal of the test signal path delayed by a variable delay time. An output of the margin measurement sensor may be scanned out, for instance to the tester device.