Dual-ADC Electrochemical Cell Circuitry for Low-Power Change Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrochemical sensors face high power consumption due to periodic sampling with high-resolution analog-to-digital converters (ADCs), which is undesirable for battery-powered devices like continuous glucose monitors that require efficient power use while detecting significant changes in analyte concentrations.
Innovation Solution
The implementation of a dual-ADC system where a low-power, low-resolution ADC (event-driven and asynchronous) detects changes between periodic high-resolution samples, allowing for reduced power consumption while maintaining the ability to monitor electrochemical characteristics, with a control module managing sampling rates and interrupt signals to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution ADCs are used for periodic sampling, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent divides the ADC system into two separate converters: a first ADC with lower resolution optimized for low-power operation and continuous monitoring, and a second ADC with higher resolution activated only when significant changes are detected. This segmentation allows the system to maintain measurement precision when needed while minimizing power consumption during stable periods.
Solution Approach 2:
The system dynamically adjusts the sampling rate and ADC activation based on analyte concentration changes. The control circuitry monitors the first ADC output and triggers the second high-resolution ADC only when changes exceed a threshold, creating an adaptive sampling strategy that balances precision and power usage according to actual measurement needs.
2Use of energy by moving object
If low-power ADCs are used, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The first low-power ADC acts as an intermediary monitoring device that continuously tracks analyte concentration changes. When it detects significant changes exceeding a predetermined threshold, it triggers the second high-resolution ADC to perform accurate measurements. This intermediary approach ensures that precision measurements are taken only when necessary, maintaining accuracy while minimizing power consumption.
Solution Approach 2:
The system uses the output from the first ADC to automatically control the activation of the second ADC. The control circuitry monitors the first ADC's digital output and autonomously determines when high-resolution sampling is needed, eliminating the need for external intervention and enabling the system to self-regulate its power consumption based on measurement requirements.
3Speed
If continuous high-resolution sampling is performed, then detection speed for changes is improved, but power consumption increases
Solution Approach 1:
The system implements periodic sampling with the first low-power ADC to continuously monitor for changes. When a significant change is detected, the second high-resolution ADC is activated to capture the change in detail. This periodic monitoring approach maintains detection speed for significant events while avoiding the continuous power consumption of high-resolution sampling.
Solution Approach 2:
The system changes the sampling parameters dynamically based on analyte concentration stability. During stable periods, it uses low-rate sampling with the first ADC to minimize power consumption. When significant changes occur, it switches to high-rate sampling with the second ADC to capture the change details, thus adapting the detection speed and power consumption to actual measurement needs.
Data Source
AI summary
Circuitry for processing an analyte signal obtained from an electrochemical cell, the circuitry comprising: a first analog-to-digital converter (ADC) configured to generate a first digital output based on the analyte signal; a second ADC configured to generate a second digital output based on the analyte signal; and control circuitry configured to control generation of the second digital output by the second ADC based on the first digital output from the first ADC.