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Updated: Feb 2, 2026
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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
Published on: November 1, 2024
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A Low-Power Dynamic-Range Relaxed Analog Front End for Photoplethysmogram Acquisition
Summary
This study introduces a low-power analog front-end for photoplethysmographic (PPG) signal acquisition. It accurately detects heart rate and measures blood oxygen saturation with minimal error, using advanced noise reduction techniques.
Area of Science:
- Biomedical Engineering
- Analog Integrated Circuit Design
Background:
- Photoplethysmography (PPG) is crucial for non-invasive physiological monitoring.
- Low-power, high-performance analog front-ends are essential for portable PPG devices.
Purpose of the Study:
- To present a novel low-power analog front-end for enhanced PPG signal acquisition.
- To demonstrate accurate heart rate and blood oxygen saturation measurement with minimal error.
Main Methods:
- Designed and fabricated a low-power analog front-end using 0.18-um CMOS technology.
- Employed chopping modulation for low-noise operation and a simple high-pass filter for relaxed dynamic range.
- Implemented a calibrated algorithm on a microcontroller (MCU) for signal processing.
Main Results:
- Achieved a low power consumption of approximately 72 uA at a 2.5 V supply.
- Demonstrated a low input noise of 6.45 pA/sqrt(Hz).
- Validated accurate heart rate detection and blood oxygen saturation measurement with less than 1.5% error compared to a reference simulator.
Conclusions:
- The developed analog front-end offers a viable solution for low-power, high-accuracy PPG-based physiological monitoring.
- The design integrates efficient noise reduction and signal processing for reliable performance.
- This technology can advance the development of wearable and portable health monitoring systems.
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