Temperature Shift Model for INL LUT Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for updating integrated nonlinearity (INL) look-up-tables (LUTs) in radio communication systems are time-consuming and memory-intensive due to the need for full recalibration at every temperature change, which is inefficient and limits system performance.
Innovation Solution
A mechanism that models the temperature shift using a piecewise polynomial approach, allowing for the determination of INL LUTs at any temperature with fewer parameters, reducing the need for full recalibration and minimizing memory usage by storing only a plurality of coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full calibration is performed at every temperature change, then accuracy of INL LUTs is maintained, but time consumption increases significantly
Solution Approach 1:
The patent performs full calibration only once at a reference temperature to establish baseline INL LUTs. When temperature changes occur, the system uses pre-stored temperature coefficients to calculate and apply corrections to the baseline LUTs, avoiding repeated full calibrations. This preliminary action at reference temperature enables fast updates at subsequent temperatures.
Solution Approach 2:
The patent changes the calibration approach from recalculating complete INL LUTs at each temperature to using temperature-dependent correction coefficients. These coefficients are applied to the baseline LUTs to adjust for temperature effects, transforming the problem from full recalibration to parameter-based correction.
2Loss of time
If INL LUTs are stored for multiple temperatures, then re-calibration time is reduced, but memory consumption increases
Solution Approach 1:
The patent extracts only the essential temperature-dependent parameters (correction coefficients) from the complete INL LUTs. Instead of storing full LUTs for multiple temperatures, the system stores compact coefficient sets that can be used to generate temperature-compensated LUTs from the baseline, significantly reducing memory requirements.
Solution Approach 2:
Instead of storing complete LUTs for each temperature and selecting the appropriate one, the patent inverts the approach by storing a single baseline LUT plus compact correction coefficients. The system generates temperature-specific LUTs on-demand by applying coefficients to the baseline, reducing storage needs while maintaining accuracy.
3Reliability
If conventional full calibration method is used, then comprehensive transmitter nonlinearity is corrected, but system productivity decreases
Solution Approach 1:
The patent segments the calibration process into two parts: a comprehensive full calibration performed once at reference temperature to capture all nonlinearity characteristics, and subsequent fast updates using temperature coefficients for routine temperature changes. This segmentation maintains comprehensive correction while improving update speed.
Solution Approach 2:
The patent introduces temperature correction coefficients as an intermediary between the baseline INL LUTs and temperature-compensated LUTs. These coefficients mediate the temperature adaptation process, enabling fast updates without repeating the comprehensive full calibration procedure.
Data Source
AI summary
A device may comprise: a storage for storing a reference output representing an output of an electrical circuit at a reference temperature; one or more processors, configured to: determine a temperature shift based on a comparison of an output of the electrical circuit sensed at a sensing temperature and the reference output; determine a plurality of coefficients of a model of the temperature shift, wherein the model implements one or more functions that associate the plurality of coefficients and a temperature with the temperature shift at the temperature.