SAR ADC Comparator Threshold Tuning for DAC Mismatch Compensation
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Solution Overview
Problem
Existing successive approximation register analog-to-digital converters face limitations in accuracy and efficiency due to exclusive compensation methods for digital-to-analog converters, particularly in switch capacitor arrays, leading to reduced performance in analog-to-digital conversion.
Innovation Solution
An advanced successive approximation register analog-to-digital converter is developed, incorporating a threshold voltage determining unit that dynamically sets the comparator's threshold voltage based on input or output signals, allowing for iterative adjustments to compensate for mismatches in the digital-to-analog converter, thereby enhancing accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If exclusive compensation is performed with respect to the digital-to-analog converter using switch capacitor arrays, then the device complexity is reduced, but the measurement precision and accuracy are limited
Solution Approach 1:
The patent applies dynamics by making the comparator threshold voltage adjustable and adaptive rather than fixed. The threshold voltage determining unit dynamically sets the threshold based on input signals or output signals from the comparator, allowing the system to adapt to mismatches in the digital-to-analog converter without requiring complex compensation mechanisms. This dynamic adjustment resolves the contradiction by improving measurement precision through adaptive thresholding while keeping the device complexity manageable.
Solution Approach 2:
The patent changes the parameter of comparator threshold voltage to resolve the contradiction. By making the threshold voltage adjustable and determining it based on actual signal conditions rather than using a fixed threshold, the system achieves higher conversion accuracy. This parameter change allows the comparator to compensate for digital-to-analog converter mismatches without requiring complex additional compensation circuits, thus improving measurement precision while maintaining reasonable device complexity.
2Measurement precision
If dynamic threshold voltage determination is implemented based on input or output signals, then the conversion accuracy is improved, but the device complexity increases
Solution Approach 1:
The threshold voltage determining unit operates autonomously by using the input signal or output signal from the comparator to determine the threshold voltage. This self-service mechanism allows the system to adapt to signal conditions and compensate for mismatches without requiring external complex control systems. The unit automatically adjusts the threshold based on the actual operating conditions, improving conversion accuracy while keeping the added complexity minimal compared to external compensation systems.
3Measurement precision
If iterative adjustments are performed to compensate for mismatches, then the measurement precision is improved, but the processing time increases
Solution Approach 1:
The patent applies preliminary action by determining the threshold voltage based on input signals or output signals from the comparator during the conversion process. This allows the system to proactively adjust the threshold to compensate for mismatches as they occur, rather than requiring post-conversion correction. The iterative adjustment is integrated into the conversion process itself, improving measurement precision while minimizing additional processing time by performing compensation actions during rather than after the main conversion operation.
Data Source
AI summary
An successive approximation register analog-to-digital converter is provided. The successive approximation register analog-to-digital converter includes a digital-to-analog converter, a successive approximation register, a comparator, and a threshold voltage determining unit. In this context, the threshold voltage determining unit is configured to dynamically determine the threshold voltage of the comparator on the basis of the input signal of the digital-to-analog converter or the output signal of the comparator.