Integrated Circuit Margin Measurement for Aging Risk Detection
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Solution Overview
Problem
Integrated circuits (ICs) face reliability issues due to aging mechanisms such as hot-carrier injection, bias temperature instability, oxide breakdown, electromigration, and stress migration, which can lead to timing violations and catastrophic failures, and random manufacturing defects are difficult to predict and mitigate.
Innovation Solution
A device comprising data-change pulse generators, a signal combiner, an adjustable delay circuit, and a device state element is used to generate pulses, combine and delay signals, and output a failure risk measurement signal based on a common clock, allowing for predictive failure analysis and proactive measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ICs are designed with safety factors to account for manufacturing differences and aging, then reliability is improved, but timing margins become smaller and performance headroom is reduced
Solution Approach 1:
The patent applies preliminary action by measuring and characterizing aging effects during manufacturing and initial operation, then using this information to predict future failures before they occur. The system proactively identifies ICs at risk of timing violations by analyzing current timing margins against predicted aging trajectories, allowing preventive measures to be taken before reliability deteriorates.
Solution Approach 2:
The patent implements feedback by continuously monitoring timing margins and aging effects throughout the IC's operational lifetime. The system uses measured data on timing variations and aging mechanisms to update predictions of future performance, creating a closed-loop approach that adapts to actual device behavior and provides ongoing reliability assessment.
2Reliability
If environmental and usage conditions accelerate the aging process, then device degradation is increased, but predicting and mitigating random manufacturing defects becomes more difficult
Solution Approach 1:
The patent applies self-service by enabling each IC to self-diagnose its aging state and timing margin status through built-in measurement circuits and monitoring mechanisms. The device independently characterizes its own aging effects and predicts its future performance without requiring external intervention, allowing it to identify when preventive maintenance or replacement is needed.
Solution Approach 2:
The patent replaces traditional physical inspection methods with electronic and computational approaches for defect detection. Instead of relying solely on manufacturing process control, the system uses electrical measurements of timing margins, voltage characteristics, and signal integrity to detect and predict defects, substituting mechanical/physical inspection with electronic diagnostics.
3Reliability
If charge carriers are trapped in the insulating dielectric during hot-carrier injection, then transistor threshold voltage increases, but switching delay becomes larger
Solution Approach 1:
The patent applies the skipping principle by rapidly measuring and characterizing timing margins and aging effects during early operation, before significant degradation occurs. The system quickly identifies trends in threshold voltage shifts and switching delay increases, allowing preventive actions to be taken before the degradation becomes critical and affects normal device operation.
Solution Approach 2:
The patent implements parameter changes by monitoring multiple electrical parameters including threshold voltage, switching delay, leakage current, and signal integrity over time. The system tracks how these parameters evolve under different operating conditions and environmental factors, using the changes in parameter values to predict future device performance and identify aging mechanisms.
Data Source
AI summary
Failure risk measurement in a semiconductor Integrated Circuit (IC) by generating a pulse of a preset time duration on an output path when a signal from a data path and/or control logic circuit of the semiconductor IC changes. The data paths and/or control logic circuits of the semiconductor IC have a common clock. The output paths may be combined to provide a combined output path and a signal on the combined output path may be delayed by a configurable time duration, providing a delayed combined output path signal thereby. The delayed combined output path signal may be received at a data input of a device state element, which is clocked by a signal based on the common clock and outputs a failure risk measurement signal.