ADC Digital Calibration Using Dither Extraction for Linearity
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Solution Overview
Problem
High-speed and high-precision analog-to-digital converters face issues such as a decrease in signal-to-noise ratio and reduction of linearity due to process deviations and insufficient component intrinsic gain, as well as a decrease in signal-to-noise ratio caused by dither injection.
Innovation Solution
The solution involves a high-speed and high-precision analog-to-digital converter design that includes an input configuration module, an analog-to-digital conversion module, an adaptive parameter extraction module, and a full-period data restoration module. This design generates random analog signals for dither injection, extracts correction parameters, and uses a parameter memory for storage and digital calibration to improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dither injection is used to improve linearity, then linearity is improved, but signal-to-noise ratio decreases
Solution Approach 1:
The patent extracts and removes the dither signal from the converted digital signal through correlation processing. By correlating the converted signal with the known dither signal and subtracting the correlated component, the harmful dither noise is separated and eliminated while preserving the original signal, thus improving signal-to-noise ratio while maintaining linearity benefits
Solution Approach 2:
The patent introduces correlation processing as an intermediary mechanism between dither injection and signal output. The correlation processor acts as a mediator that selectively removes dither-induced noise components while preserving the useful signal, enabling simultaneous achievement of improved linearity and maintained signal-to-noise ratio
2Reliability
If process deviation occurs, then component intrinsic gain becomes insufficient, but signal-to-noise ratio and linearity decrease
Solution Approach 1:
The patent implements feedback through correlation processing where the converted digital signal is correlated with the original dither signal to identify and quantify gain deviations and linearity errors. This feedback mechanism enables real-time detection and compensation of process-induced variations, maintaining performance despite component gain insufficiency
Solution Approach 2:
The patent compensates for process deviations by dynamically adjusting correction parameters based on correlation results. By changing the correction parameters adaptively according to measured deviations, the system maintains accurate linearity and signal-to-noise ratio even when component intrinsic gain varies due to process variations
3Reliability
If process deviation occurs, then component intrinsic gain becomes insufficient, but signal-to-noise ratio decreases
Solution Approach 1:
The patent extracts and removes dither-induced noise components from the converted signal through correlation processing, separating the harmful noise from the useful signal. This extraction process improves signal-to-noise ratio by eliminating the dither noise that would otherwise degrade measurement precision
Solution Approach 2:
Correlation processing serves as an intermediary mechanism that bridges the gap between dither injection and signal output. It mediates the conflict by selectively removing dither noise while preserving the original signal, enabling improved linearity without sacrificing signal-to-noise ratio
Data Source
AI summary
An analog-to-digital converter includes an input configuration module, an analog-to-digital conversion module, an adaptive parameter extraction module, and a full-period data restoration module. In a parameter extraction working mode, correction parameters are extracted through cooperation of the input configuration module, the analog-to-digital conversion module, the adaptive parameter extraction module, and the full-period data restoration module. In a normal working mode, digital calibration and correction of digital signals are implemented by using the analog-to-digital conversion module and the correction parameters. The correction parameters include a dither correction parameter, a gain correction parameter, and a mismatch error correction parameter.