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Related Experiment Video

Updated: Sep 29, 2025

Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
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Broadband Zero-Power Wakeup MEMS Device for Energy-Efficient Sensor Nodes.

Minhaz Ahmed1, Torben Dankwort1, Sven Grünzig1

  • 1Fraunhofer Institute for Silicon Technology ISIT, Fraunhoferstr. 1, 25524 Itzehoe, Germany.

Micromachines
|March 26, 2022
PubMed
Summary

This study introduces a zero-power wakeup system for energy-efficient sensors using a piezoelectric micro-electro-mechanical system (MEMS) energy harvester. This innovative design enables low-frequency, fast wakeups with minimal power loss, extending battery life.

Keywords:
GreenICTenergy efficiencylossless standbypiezoelectric MEMS energy harvestingwafer-level-integrated micromagnetswireless sensor nodes WSNzero-power wakeup

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Area of Science:

  • Energy Harvesting
  • Micro-Electro-Mechanical Systems (MEMS)
  • Sensor Technology

Background:

  • Existing energy harvesting solutions for sensors often face challenges with hybrid magnet assembly, increasing complexity and cost.
  • Achieving efficient, low-power wakeup mechanisms is crucial for extending the operational lifetime of autonomous sensor nodes.

Purpose of the Study:

  • To present a novel zero-power wakeup scheme for energy-efficient sensor applications.
  • To overcome the limitations of hybrid assembly in current chip-level magnet integration.
  • To demonstrate a piezoelectric MEMS energy harvester with wafer-level-integrated micromagnets for enhanced wakeup functionality.

Main Methods:

  • Development of a piezoelectric MEMS energy harvester with integrated micromagnets at the wafer level.
  • Utilizing frequency up-conversion for excitation at low frequencies (< 50 Hz).
  • Employing magnetic force coupling for both mechanical contact and contactless excitation methods.

Main Results:

  • Achieved a wakeup time of 30–50 ms in a discrete circuit using frequency up-conversion.
  • Demonstrated extremely low off-state power loss of 0.1 nW, achieving a virtually lossless scheme.
  • The system allows for excitation via mechanical contact and contactless methods.

Conclusions:

  • The proposed zero-power wakeup scheme offers a significant advancement for energy-efficient sensor applications.
  • Wafer-level integration of micromagnets simplifies assembly and enhances performance compared to existing solutions.
  • The technology has the potential to substantially extend battery lifetime in wireless sensor nodes.