ADC Stage Error Correction for Gain, Weight, and Jitter
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Solution Overview
Problem
Conventional error extraction methods for analog-to-digital converters are limited to single-stage corrections and cannot effectively address multi-stage and multi-error corrections, leading to reduced precision and linearity due to uncorrected gain and jitter errors, and inefficient test and correction processes.
Innovation Solution
A method for correcting analog-to-digital converters involves extracting gain, weight, and jitter errors across all conversion stages, followed by two rounds of corrections to improve precision and linearity, using variable step sizes for enhanced convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional error extraction methods are used, then single-stage weight errors can be extracted, but multi-stage and multi-error corrections cannot be performed
Solution Approach 1:
The correction process is divided into multiple stages: first extracting and correcting weight errors of all conversion stages, then extracting and correcting gain errors, and finally extracting and correcting jitter errors. Each stage addresses specific error types systematically, enabling comprehensive multi-stage and multi-error correction that conventional single-stage methods cannot achieve.
2Measurement precision
If converter precision is improved, then signal collection quality increases, but the number of sample points required for error extraction increases exponentially
Solution Approach 1:
The method performs preliminary error extraction and correction in a systematic sequence before final high-precision conversion. By extracting weight errors, gain errors, and jitter errors in separate preliminary stages, the method reduces the computational burden for high-precision applications without requiring exponential increases in sample points, thereby maintaining test and correction efficiency.
3Stability of the object's composition
If jitter is introduced to improve linearity, then linearity increases, but precision decreases due to uncorrected jitter weights
Solution Approach 1:
The method converts the harmful effect of jitter into a beneficial correction opportunity. By specifically extracting jitter weights as a separate error component and applying dedicated correction, the method eliminates the negative impact of jitter on precision while preserving the linearity improvements gained from introducing jitter. This transforms jitter from a source of error into a controlled parameter that can be corrected.
Data Source
AI summary
A method for correcting an analog-to-digital converter includes the following steps: extracting gain errors and weight errors of all conversion stages of an analog-to-digital converter; performing first correction on the analog-to-digital converter based on the gain errors and the weight errors; extracting jitter errors of all conversion stages of the analog-to-digital converter after the first correction; and performing a second correction on the analog-to-digital converter based on the jitter errors. According to the disclosure, the gain errors, the weight errors, and the jitter errors of all conversion stages are successively extracted, and then the analog-to-digital converter is corrected. Precision after the corrections is higher. An actual weight of each quantization unit at each conversion stage, an actual inter-stage gain of each conversion stage and an actual weight of jitter are extracted, impact of a jitter weight is eliminated during outputting, and a signal-to-noise ratio of analog-to-digital conversion is increased.