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Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
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Published on: October 20, 2021

A 1.5V 120nW CMOS programmable monolithic reference generator for wireless implantable system.

Sun-Il Chang1, Khaled AlAshmouny, Euisik Yoon

  • 1Electrical Engineering and Computer Science Department, University of Michigan, Ann Arbor, MI 48109, USA. schang@umich.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
Summary

This study presents a low-power, programmable CMOS reference generator for wireless implantable systems. It offers adjustable voltage and current outputs while maintaining stability under power supply variations, making it ideal for miniaturized electronics.

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Area of Science:

  • Integrated Circuits
  • Biomedical Engineering
  • Low-Power Electronics

Background:

  • Wireless implantable systems require highly stable and low-power reference generators.
  • Existing solutions often face challenges with power supply variations and miniaturization.
  • Programmability is crucial for adapting to diverse system requirements.

Purpose of the Study:

  • To design and characterize a programmable monolithic reference generator for wireless implantable systems.
  • To optimize the generator for low power consumption (120 nW) and small area (0.011 mm²).
  • To ensure tolerance to power supply variations and provide adjustable voltage and current outputs.

Main Methods:

  • Implementation of a 1.5 V CMOS reference generator using 0.25 μm technology.
  • Characterization of power supply rejection ratio (PSRR) for both voltage and current references.
  • Testing of programmability for output voltage and current ranges.
  • Measurement of power consumption and chip area.

Main Results:

  • Achieved a power consumption of 120 nW at 1.5 V.
  • Demonstrated low power line sensitivities: 0.02%/V for voltage and 1.1%/V for current.
  • Implemented in a minimal area of 0.011 mm², the smallest known in 0.25 μm technology.
  • Programmable output ranges: 0.71 V to 1.03 V for voltage and 20 nA to 33 nA for current.
  • Operates across an input voltage range of 1.5 V to 3.5 V.

Conclusions:

  • The developed reference generator is a highly efficient and compact solution for wireless implantable systems.
  • Its programmability and stability make it suitable for a wide range of biomedical applications.
  • Represents a significant advancement in miniaturized, low-power integrated circuit design for medical devices.