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A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer.

Chaoping Zhang1, Robert Gallichan1, David M Budgett1

  • 1Auckland Bioengineering Institute, The University of Auckland, Auckland 1010, New Zealand.

Micromachines
|September 30, 2020
PubMed
Summary
This summary is machine-generated.

This study details a new capacitive pressure sensor interface circuit for implantable devices, enabling wireless power and data transfer. The design achieves high accuracy and low power consumption for medical applications.

Keywords:
ADCAFEBGRLDOSC op-ampSC samplingoscillatorrectifier

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Area of Science:

  • Integrated Circuit Design
  • Biomedical Engineering
  • Sensor Technology

Background:

  • Implantable pressure sensors require efficient interface circuits for wireless operation.
  • Existing designs often face challenges with power management and data transmission.
  • CMOS technology offers a path for miniaturization and integration.

Purpose of the Study:

  • To design and present a novel interface circuit for an implantable capacitive pressure sensor.
  • To enable wireless power supply and data transfer for the sensor.
  • To achieve high accuracy and low power consumption in a compact IC.

Main Methods:

  • Utilized 180 nm XH018 CMOS technology for integrated circuit design.
  • Incorporated full-bridge rectifiers, LDOs, analog front-end, ADC, I2C, and oscillator.
  • Implemented inductive backscatter for wireless data transfer.

Main Results:

  • Achieved a resolution of 0.98 mmHg (1.4 fF).
  • Demonstrated an average total power consumption of 7.8 mW.
  • Reported worst-case accuracy of ±3.2% (-20 to 80 °C), improving to ±0.86% (20 to 60 °C).

Conclusions:

  • The designed interface IC successfully integrates essential functions for an implantable capacitive pressure sensor.
  • The circuit provides stable power and accurate data conversion with wireless capabilities.
  • The performance metrics indicate suitability for advanced biomedical monitoring applications.