Digital Slope ADC with Statistical Encoding for Low-Noise Conversion
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Solution Overview
Problem
Existing analog to digital converters face a trade-off between high performance and low power consumption, with current circuit architectures being insufficient to meet the requirements of high resolution, low noise, and wide bandwidth while also increasing circuit area and power consumption.
Innovation Solution
A digital slope analog to digital converter device utilizing a capacitor array circuit, switching circuitry, multiple comparator circuits, encoder circuitries, and a control logic circuit, which generates digital codes by comparing input signals with predetermined voltages and performing statistics calculations to reduce noise impacts, without the need for additional DC offset calibration mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional analog to digital converter circuit architecture is used to achieve high performance (high resolution, low noise, wide bandwidth), then conversion performance is improved, but circuit area and power consumption increase
Solution Approach 1:
The patent segments the analog-to-digital conversion process into multiple independent stages: analog signal processing stage (capacitor array and switching circuitry), comparison stage (multiple comparator circuits), encoding stage (encoder circuitries), and digital processing stage (control logic circuit). Each stage operates independently with optimized power consumption characteristics, allowing high-performance conversion without proportional increase in overall power consumption.
Solution Approach 2:
The patent implements periodic sampling and conversion cycles where the analog signal is processed in discrete time intervals. The switching circuitry operates in periodic phases (sampling phase, conversion phase), and multiple comparator circuits operate in synchronized periodic cycles. This periodic operation allows efficient resource utilization and reduced average power consumption while maintaining high conversion performance.
2Measurement precision
If traditional analog to digital converter circuit architecture is used to achieve high performance (high resolution, low noise, wide bandwidth), then conversion performance is improved, but circuit area increases
Solution Approach 1:
The patent divides the converter into spatially separated functional modules: capacitor array and switching circuitry (analog section), comparator circuits (comparison section), encoder circuitries (encoding section), and control logic (digital section). This segmentation allows each module to be optimized for minimal area while maintaining performance, and enables efficient layout planning to reduce overall circuit footprint.
Solution Approach 2:
The switching circuitry serves multiple functions: signal routing, sampling control, and timing synchronization for multiple comparators. The capacitor array provides both signal conditioning and reference voltage generation. This multi-functionality reduces the need for separate dedicated circuits, thereby minimizing overall circuit area while achieving high conversion performance.
3Measurement precision
If additional DC offset calibration mechanisms are added to improve conversion accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The comparator circuits automatically compensate for DC offset through their inherent differential operation and the statistical processing of multiple comparison results. The control logic circuit performs digital calibration by analyzing the distribution of conversion results and adjusting decision thresholds, eliminating the need for separate analog calibration circuits. This self-calibration approach maintains high accuracy while minimizing added complexity.
Solution Approach 2:
The control logic circuit implements feedback mechanisms where conversion results from multiple comparators are fed back for statistical analysis. Based on this feedback, the system automatically adjusts encoding thresholds and compensates for systematic errors including DC offset. This feedback-based calibration achieves high measurement precision without requiring complex external calibration hardware.
Data Source
AI summary
A digital slope analog to digital converter device includes a capacitor array circuit, a switching circuitry, comparator circuits, encoder circuitries, and a control logic circuit. The capacitor array circuit generates a first signal according to an input signal and switching signals. The switching circuitry generates the switching signals according to an enable signal and a first valid signal in the valid signals. Each of the comparator circuits compares the first signal with a predetermined voltage, in order to generate a corresponding one of the valid signals. Each of the encoder circuitries receives the switching signals according to a corresponding one of the valid signals, in order to generate a corresponding one of sets of first digital codes. The control logic circuit performs a statistics calculation according to the sets of first digital codes, in order to generate a second digital code.