On-Chip Process Sensing for PVT Compensation in IC Monitoring
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Solution Overview
Problem
Semiconductor devices exhibit performance variations due to differences in the semiconductor process, temperature, and supply voltage, leading to inconsistent performance across devices of the same design and manufacture.
Innovation Solution
A sensor system comprising a process sensor, temperature sensor, and voltage sensor integrated into an integrated circuit, which characterizes the semiconductor process and compensates for temperature and voltage variations to ensure consistent performance across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If semiconductor devices are manufactured using the same fabrication equipment and processing steps, then manufacturing consistency is improved, but performance variations still occur due to minute process differences
Solution Approach 1:
The patent applies preliminary action by incorporating process sensors during the manufacturing stage to capture and characterize process parameters. The process sensor is integrated into the semiconductor device before operation, allowing it to sense and store process information that can later be used for compensation, thus addressing performance variations caused by minute process differences
Solution Approach 2:
The patent implements feedback by using the process sensor to continuously monitor and characterize process parameters, then using this information to compensate for performance variations. The system creates a closed-loop where process information is fed back to adjust and maintain consistent device performance despite manufacturing variations
2Adaptability or versatility
If semiconductor devices operate under varying temperature and voltage conditions, then operational flexibility is improved, but performance consistency deteriorates
Solution Approach 1:
The patent applies dynamics by implementing temperature and voltage sensors that continuously monitor operating conditions and enable dynamic compensation. The system adapts in real-time to varying temperature and voltage conditions, adjusting device operation to maintain consistent performance across different environmental conditions
Solution Approach 2:
The patent uses parameter changes by sensing temperature and voltage parameters and using this information to compensate for their effects on device performance. The system changes operational parameters based on sensed conditions, allowing the device to maintain consistent performance across varying temperature and voltage environments
Data Source
AI summary
An integrated circuit includes a process sensor, a temperature sensor, and a voltage sensor. The process sensor is configured to sense a process parameter indicative of a semiconductor process by which the integrated circuit is formed and, based upon the sensed process parameter, to provide a characterization of the semiconductor process to the output of the process sensor. The temperature sensor is configured to provide an indication of a temperature of the integrated circuit to an output of the temperature sensor and the voltage sensor is configured to provide an indication of a power supply voltage level of the integrated circuit to an output of the voltage sensor. The output of the process sensor is coupled to at least one of the temperature sensor and the voltage sensor to compensate at least one of the indication of the temperature and the indication of the power supply voltage level.