Adaptive ADC Error Correction for Nonlinear Compensation
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Solution Overview
Problem
High-speed analog to digital converters often suffer from inaccuracies due to nonlinearities and mismatches in analog components, which existing technologies fail to adequately compensate for, leading to reduced accuracy and reliability.
Innovation Solution
The implementation of an adaptive analog to digital converter system that uses a combination of high accuracy and lower accuracy converters, with iterative logic and error correction mechanisms, such as subtractors and buffers, to determine and correct for errors, thereby enhancing the accuracy of the conversion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lower accuracy analog components are used in high-speed analog to digital converters, then power consumption is reduced and speed is improved, but measurement precision deteriorates
Solution Approach 1:
The converter is divided into multiple parallel channels with different accuracy levels. A first converter generates high-accuracy digital values while second converters generate lower-accuracy digital values. This segmentation allows the system to achieve high accuracy for critical conversions while using simpler, faster converters for other purposes, resolving the contradiction between accuracy and complexity.
Solution Approach 2:
An error correction mechanism acts as an intermediary between the high-accuracy and low-accuracy converters. The system calculates error values representing the difference between corresponding digital outputs from the two converters and uses these errors to correct the high-accuracy converter's output, thereby improving overall measurement precision without requiring all components to be high-accuracy.
2Measurement precision
If lower accuracy analog components are used, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The system applies partial correction by using error values from a subset of conversions to improve accuracy. Rather than requiring all converter components to operate at high accuracy (which would increase power consumption), the system selectively applies error correction only where needed, achieving improved measurement precision with reduced overall power consumption.
3Measurement precision
If higher speed conversion is implemented using lower accuracy components, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring the error between high-accuracy and low-accuracy converter outputs and using this error information to correct subsequent conversions. This feedback mechanism allows the high-speed low-accuracy converters to achieve the precision of high-accuracy converters, resolving the contradiction between speed and precision.
Data Source
AI summary
An apparatus for converting an analog signal to a digital signal comprising a first analog to digital converter for generating a first digital value from an analog value. A second analog to digital converter for generating a second digital value from the analog value. Logic for determining a correction factor for the second digital value based on a difference between the first digital value and the second digital value, wherein the logic updates the correction factor.