• English
  • Deutsch
  • Log In
    Password Login
    Research Outputs
    Fundings & Projects
    Researchers
    Institutes
    Statistics
Repository logo
Fraunhofer-Gesellschaft
  1. Home
  2. Fraunhofer-Gesellschaft
  3. Artikel
  4. A Capacitive Sensor Readout IC with Antenna-Integrated Sensor for Proximity Detection in Handheld Mobile Devices
 
  • Details
  • Full
Options
July 14, 2024
Journal Article
Title

A Capacitive Sensor Readout IC with Antenna-Integrated Sensor for Proximity Detection in Handheld Mobile Devices

Abstract
In this letter, a capacitive sensor readout integrated circuit (IC) and a prototype using an inverted-F antenna (IFA) as the capacitive sensor for proximity detection are presented. A unique front-end circuit converts the single-ended sensing capacitance with one electroplate being always grounded into differential signal utilizing correlated double sampling while suppressing the noise of the front-end circuits. The implemented IC shows that with an offset capacitance of 72pF , a noise floor of 17fF can be achieved. The IC was designed and fabricated in a 90nm RF SOI complementary metal-oxide semiconductor (CMOS) switch technology for its possible integration with radio-frequency (RF) antenna tuning switches. The assembled phone mockup prototype demonstrates the capability of the proposed system to detect the proximity of human body parts with high offset capacitance to maintain the RF performance of the antenna for sub- 3GHz mobile communication.
Author(s)
Hsu, Ting-Li
Hagelauer, Amelie  
Fraunhofer-Einrichtung für Mikrosysteme und Festkörper-Technologien EMFT  
Solomko, Valentyn
Journal
IEEE sensors letters  
Open Access
DOI
10.1109/LSENS.2024.3414655
Language
English
Fraunhofer-Einrichtung für Mikrosysteme und Festkörper-Technologien EMFT  
Keyword(s)
  • Sensor systems

  • antenna

  • capacitive sensor

  • complementary metal-oxide semiconductor (CMOS)

  • correlated-dobule sampling (CDS)

  • IFA

  • PIFA

  • proximity sensor

  • specific absorption rate (SAR) sensor

  • Cookie settings
  • Imprint
  • Privacy policy
  • Api
  • Contact
© 2024