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Related Experiment Videos

A CMOS humidity sensor for passive RFID sensing applications.

Fangming Deng1, Yigang He2, Chaolong Zhang3

  • 1School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China. 13755633966@163.com.

Sensors (Basel, Switzerland)
|May 21, 2014
PubMed
Summary
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This study introduces a low-cost, low-power CMOS humidity sensor for RFID applications. Its novel design achieves significant power reduction and excellent performance, enabling efficient passive sensing.

Area of Science:

  • Integrated Circuits
  • Sensor Technology
  • Wireless Communication

Background:

  • Passive RFID systems require low-power sensing solutions.
  • Existing humidity sensors often lack cost-effectiveness or high efficiency.
  • CMOS technology offers potential for miniaturized and integrated sensor designs.

Purpose of the Study:

  • To develop a low-cost, low-power CMOS humidity sensor for passive RFID.
  • To implement a novel sensor interface for enhanced signal processing and reduced power consumption.
  • To validate the sensor's performance characteristics, including linearity and stability.

Main Methods:

  • Fabrication of a humidity sensing element using standard CMOS technology without post-processing.
  • Development of a Phase-Locked Loop (PLL)-based interface to convert sensor signals from voltage to frequency domain.

Related Experiment Videos

  • Utilization of fully digital circuits for ultra-low voltage operation and minimal power draw.
  • Testing and characterization of the fabricated sensor on a TSMC 0.18 μm CMOS process.

    • Main Results:

    • The humidity sensor demonstrates excellent linearity and stability across the relative humidity range.
    • The sensor interface circuit achieves ultra-low power consumption of 1.05 µW at a 0.5 V supply voltage.
    • Power consumption is reduced by at least an order of magnitude compared to previous designs.
    • Standard CMOS fabrication ensures low manufacturing costs.

    Conclusions:

    • The proposed CMOS humidity sensor is a viable, cost-effective solution for passive RFID applications.
    • The PLL-based interface effectively enables low-power, fully digital operation.
    • The sensor's performance metrics meet the requirements for efficient environmental monitoring in RFID systems.