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Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
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A Bootstrapped Comparator-Switched Active Rectifying Circuit for Wirelessly Powered Integrated Miniaturized Energy

Cihun-Siyong Alex Gong1,2,3, Shiang-Wei Li4, Muh-Tian Shiue5

  • 1Department of Electrical Engineering, School of Electrical and Computer Engineering, College of Engineering, Chang Gung University, Taoyuan 33302, Taiwan. alex.mlead@gmail.com.

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Summary

A new wireless power supply architecture improves energy harvesting for biomedical devices. This novel MOS harvester achieves high power conversion efficiency, enabling advanced miniaturized sensing systems.

Keywords:
AC-DC power convertersRFID tagsenergy harvestingimplantable biomedical devicesintegrated circuitsrectifying circuitwireless sensing systems

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Materials Science

Background:

  • Increasing human life expectancy is linked to technological advancements in biomedical electronics.
  • Wearable and implantable devices require efficient wireless power solutions.
  • Traditional diode circuits in power systems have limitations.

Purpose of the Study:

  • To propose a new architecture for wireless power supply systems in biomedical applications.
  • To improve the performance of energy harvesters in terms of power conversion.
  • To enable uninterrupted, permanent wireless power for biomedical devices.

Main Methods:

  • Developed a novel architecture replacing traditional diode circuits with a MOS harvester.
  • Leveraged near-ideal power transistor switching and reverse current prevention.
  • Designed and verified the system using TSMC 180-nm process for wireless near-field power supply.

Main Results:

  • Achieved Voltage Conversion Efficiency (VCE) of 73.55-95.12%.
  • Achieved Power Conversion Efficiency (PCE) of 80.36-90.08%.
  • Demonstrated high performance with output loads of 0.1-1 kΩ under 3.3 V ac input, within a 1.189 mm² area.

Conclusions:

  • The proposed MOS harvester significantly enhances power conversion efficiency for wireless biomedical systems.
  • This technology creates a niche for "green-energy" miniaturized energy sensing systems.
  • Enables cutting-edge, wirelessly powered biomedical electronics applications.