Semiconductor Input Buffer Self-Diagnosis and Refresh
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Solution Overview
Problem
The VIH/VIL characteristics of input buffers in semiconductor devices deteriorate over time due to aging, leading to reliability issues, especially when higher specifications are required, and existing solutions do not effectively address the long-term degradation of these characteristics.
Innovation Solution
A semiconductor device that performs self-diagnosis of input buffer deterioration by measuring VIH/VIL characteristics and operation history, using a control circuit to apply test voltages and determine threshold values, and optionally providing a refresh circuit to recover deteriorated buffers, allowing for redundant input buffers to maintain operation during diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If higher specifications of VIH/VIL are required, then the input buffer performance is improved, but the long-term reliability deteriorates due to aging
Solution Approach 1:
The patent applies preliminary action by performing self-diagnosis of VIH/VIL characteristics before deterioration becomes critical. The control circuit periodically measures the input buffer's voltage thresholds and detects aging trends in advance, allowing the system to identify deterioration early and take corrective actions such as buffer switching or parameter adjustment before the buffer fails completely.
Solution Approach 2:
The patent implements feedback by continuously monitoring the operation history and VIH/VIL characteristics of input buffers. The control circuit uses this feedback information to dynamically adjust system operation, switch between redundant buffers, or alert users about impending failures, thereby maintaining reliability even as individual buffers age.
2Reliability
If self-diagnosis function is added to detect VIH/VIL characteristics, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the control circuit to perform multiple functions: it controls the input buffer operation, measures VIH/VIL characteristics, analyzes operation history, and determines buffer validity. This multi-functional approach avoids adding separate dedicated circuits for each function, thereby limiting the increase in device complexity while achieving comprehensive monitoring and control.
Solution Approach 2:
The patent implements self-service through the self-diagnosis capability where the input buffer system monitors its own VIH/VIL characteristics without requiring external testing equipment. The control circuit within the device itself performs the measurement and evaluation, making the system self-diagnostic and reducing the need for external complexity.
3Reliability
If refresh circuit is provided to recover deteriorated buffers, then the long-term reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies discarding and recovering by providing a refresh circuit that can restore the characteristics of deteriorated input buffers. When aging causes VIH/VIL drift, the refresh circuit applies corrective voltages or signals to recover the buffer's original performance, extending its useful life. This allows the system to recover and reuse buffers rather than permanently discarding them, improving reliability while managing complexity through selective refresh operations.
Data Source
AI summary
A semiconductor device includes an external terminal, an input buffer having an input terminal connected to the external terminal, a voltage generating circuit configured to generate a test voltage supplied to the input terminal, and a control circuit configured to determine whether the input buffer is deteriorated based on the test voltage supplied to the input terminal and an output level of the input buffer responding to the test voltage.