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Highly Sensitive Readout Interface for Real-Time Differential Precision Measurements with Impedance Biosensors
Sara Neshani1, Kasra Momeni2, Degang J Chen3
1Electrical and Computer Engineering Department, University of Alabama, Tuscaloosa, AL 35401, USA.
Biosensors
|January 21, 2023
Summary
This study introduces a general method for designing real-time readout units for sensitive impedance transducers. The developed system achieves 8-bit resolution for accurate clinical and environmental monitoring.
Area of Science:
- Biomedical Engineering
- Sensor Technology
- Signal Processing
Background:
- Sensitive impedance transducers are crucial for clinical and environmental monitoring.
- There is a need for precise, cost-effective, real-time readout units for these transducers.
- Existing methods often lack the required resolution and real-time processing capabilities.
Purpose of the Study:
- To present a general readout method and design procedure for interfacing impedance transducers with small fractional impedance changes.
- To develop a readout unit capable of high-resolution, real-time data acquisition and processing.
- To provide a guideline for designing custom readout units for laboratory and commercial applications.
Main Methods:
- A detailed design procedure for a general readout method was developed.
- A readout unit incorporating amplification, filtering, and real-time data acquisition/processing using a single microcontroller was proposed.
- Key design parameters including signal-to-noise ratio (SNR), common-mode-to-differential conversion, digitization, and data processing were discussed.
- A single-frequency readout unit with 8-bit resolution was designed and implemented for differentially placed transducers.
Main Results:
- The proposed method enables the design of readout units for impedance transducers exhibiting small impedance changes.
- An 8-bit resolution was achieved even at low signal-to-noise ratios (SNR) of approximately 7 dB.
- Real-time data acquisition and sine fitting were successfully implemented using a single microcontroller.
- The designed unit demonstrated effective interfacing with differentially placed transducers.
Conclusions:
- The presented readout method serves as a general guideline for designing custom interface units for various impedance transducers.
- The developed system offers a cost-effective and precise solution for real-time monitoring in clinical and environmental applications.
- The methodology facilitates the verification of transducer performance for field deployment and commercialization.
