Sensor Output Correction Circuit Without Large Lookup Tables
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Solution Overview
Problem
Existing sensor output correction technologies face limitations in accuracy and memory capacity due to the increasing size of correction tables required for higher accuracy, which can lead to reduced performance when memory is limited.
Innovation Solution
A sensor output correction circuit that includes an analog-to-digital converter and an arithmetic unit with a multiply adder and non-restoring divider, which corrects output data based on reference voltages and input voltages, allowing for accurate correction without the need for large correction tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of the correction table is increased to improve correction accuracy, then the accuracy of correcting sensor outputs is improved, but the memory capacity required increases
Solution Approach 1:
The patent changes the fundamental parameter of correction from using a large lookup table to using a mathematical model with a small number of parameters (gain and offset). By fitting a linear model y = ax + b to the correction data, the system achieves high correction accuracy while requiring minimal memory to store only the parameters a and b, rather than a large table of correction values for each pixel.
2Measurement precision
If the size of the correction table is increased to improve correction accuracy, then the accuracy of correcting sensor outputs is improved, but the device complexity increases
Solution Approach 1:
The patent simplifies the correction system by changing from a complex large-scale lookup table approach to a simple linear parameter model. The correction is achieved through basic arithmetic operations (multiplication and addition) using only two parameters (gain and offset), significantly reducing device complexity while maintaining correction accuracy.
Solution Approach 2:
The patent extracts the essential correction characteristics from the sensor data by fitting a linear model, separating the correction into two independent parameters (gain and offset). This extraction approach eliminates the need for complex lookup tables while preserving the correction functionality.
Data Source
AI summary
A sensor output correction circuit includes an analog-to-digital converter configured to receive an input voltage corresponding to a sensor output of a sensor and a reference voltage that are selectively input to the analog-to-digital converter; and an arithmetic unit configured to correct output data, which is output from the analog-to-digital converter when the input voltage is input to the analog-to-digital converter, based on an output value that is output from the analog-to-digital converter when the reference voltage is input to the analog-to-digital converter. The arithmetic unit includes a multiply adder and a non-restoring divider.