Single chip dual plate capacitive proximity sensor with high noise immunity

Yong Sin Kim, Soon Ik Cho, Dong Ho Shin, Jingu Lee, Kwang Hyun Baek

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


This letter presents a dual plate capacitive proximity sensor (PS) that is integrated into a single chip with high environmental noise immunity. To efficiently reject environmental noise, the proposed PS employs two noise rejection techniques: 1) the use of a switched-charge amplifier and 2) synchronous sampling/filtering technique. The proposed PS is fabricated using a standard CMOS 0.5-μm process, and it occupies an area of 0.7 mm×0.3 mm. Experimental results show that the proposed PS can detect an object up to 8 cm away from the sensor at an average current of 370 μA with a resolution of 1% output frequency.

Original languageEnglish
Article number6651688
Pages (from-to)309-310
Number of pages2
JournalIEEE Sensors Journal
Issue number2
Publication statusPublished - 2014 Feb
Externally publishedYes


  • Capacitive
  • Dual plate
  • Noise immunity
  • Proximity sensor

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


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