Analog Temperature Sensor Trimming via Slope Error Correction
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Solution Overview
Problem
On-die temperature sensors in memory dies face measurement errors due to non-ideal slope correlations, requiring lengthy physical calibration across various temperatures, which is inefficient and prone to errors.
Innovation Solution
A method and apparatus for dynamically trimming analog temperature sensors by determining a correction function based on slope errors between high and low temperature codes, allowing for quick digital correction of temperature measurements across the qualification temperature range without significant latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical calibration is performed across the entire range of operable temperatures, then measurement precision is improved, but loss of time increases due to lengthy testing process
Solution Approach 1:
The patent performs preliminary calibration at only two temperature extremes (lowest and highest temperatures of the qualification range) to establish correction factors. These pre-determined correction factors are then applied digitally to compensate for slope errors across the entire temperature range, eliminating the need for time-consuming calibration at every temperature point while maintaining measurement accuracy.
2Manufacturing precision
If physical calibration is performed at multiple temperatures, then manufacturing precision is improved, but productivity decreases due to extended calibration duration
Solution Approach 1:
The invention performs preliminary calibration actions at only two temperature points (lowest and highest) to determine correction factors that compensate for slope errors across the entire qualification temperature range. This preliminary calibration approach maintains manufacturing precision while dramatically reducing calibration time and increasing production throughput.
Solution Approach 2:
The patent replaces extensive physical/mechanical calibration procedures across multiple temperature points with a simplified digital correction approach. By calculating correction factors at two temperature extremes and applying them digitally, the system substitutes lengthy physical calibration with rapid digital computation, thereby improving productivity without sacrificing precision.
3Loss of time
If correction function calculation is performed quickly, then loss of time is reduced, but measurement precision may deteriorate due to simplified calibration
Solution Approach 1:
The patent performs preliminary calibration at the two extreme temperature points to accurately determine correction factors that account for slope errors. These pre-calculated correction factors are then applied rapidly during operation, achieving both quick response time and maintained measurement precision across the entire temperature range.
Data Source
AI summary
A method for trimming analog temperature sensors. First, raise a temperature of a temperature sensor to a highest temperature of a qualification temperature range. Then, trim the temperature sensor such that a high temperature code generated by the temperature sensor represents an actual temperature reported by the temperature sensor at the highest temperature. Next, lower the temperature of the temperature sensor to a lowest temperature of the qualification temperature range. Determine a slope error between the high temperature code and a low temperature code generated by the temperature sensor at the lowest temperature. Finally, determine a correction function that compensates for the slope error of measured temperature codes generated by the temperature sensor for temperatures across the qualification temperature range.