Correlated Comparator Circuit for ADC Environmental Noise Filtering
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Solution Overview
Problem
High precision and low voltage sensors require precise noise measurement in analog-to-digital converters (ADCs), but existing technologies struggle to effectively reduce environmental noise, which impacts comparator resolution and accuracy.
Innovation Solution
A circuit and method using a signal correlated unit and comparator system that includes a field programmable gate array (FPGA) board, digital-to-analog converters (DACs), and a receiver unit to generate correlated output signals, reducing noise through differential comparison and noise filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high precision sensors and ADCs are used to achieve higher resolution, then measurement precision is improved, but environmental noise becomes more significant and affects comparator accuracy
Solution Approach 1:
The patent applies correlated double sampling to convert environmental noise into a measurable signal. By sampling the same noise signal at two different times and correlating the results, the noise that initially degrades measurement precision is transformed into a detectable pattern that can be distinguished from actual signal changes, thereby converting the harmful noise factor into a beneficial measurement opportunity
Solution Approach 2:
The patent implements noise measurement feedback by continuously monitoring the comparator's input-referred noise and using this information to adjust measurement parameters. The system measures the noise floor, compares it against threshold values, and dynamically adapts the sampling strategy to maintain measurement precision despite the presence of environmental noise
2Object-affected harmful factors
If complex noise filtering circuits are added to reduce environmental noise, then noise reduction is improved, but device complexity and area increase
Solution Approach 1:
The patent introduces a signal correlated unit as an intermediary component between the comparator and the noise environment. This unit performs correlated double sampling to filter environmental noise without requiring complex analog filtering circuits. The intermediary processes the signal digitally, achieving noise reduction while keeping the analog front-end simple and area-efficient
Solution Approach 2:
The patent replaces complex analog noise filtering mechanisms with digital signal processing techniques. Instead of using large analog filters, amplifiers, and passive components to reduce noise, the system uses correlated double sampling implemented in the signal correlated unit, substituting mechanical/analog filtering with digital correlation algorithms that achieve superior noise rejection with minimal hardware overhead
Data Source
AI summary
The present disclosure provides a circuitry. The circuitry includes a comparator and a signal correlated circuit. The comparator includes a first input terminal, a second input terminal, and an output terminal. The signal correlated circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal is coupled to receive a first input signal. The second input terminal is coupled to receive a second input signal independent from the first input signal. The first output terminal is configured to generate a first output signal and to send the first output signal to the first input terminal of the comparator. The second output terminal is configured to generate a second output signal and to send the second output signal to the second input terminal of the comparator. The first output signal and the second output signal are correlated.