Single Chip Dual Plate Capacitive Proximity Sensor With High Noise Immunity
- Authors
- Kim, Yong Sin; Cho, Soon-Ik; Shin, Dong Ho; Lee, Jingu; Baek, Kwang-Hyun
- Issue Date
- Feb-2014
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Proximity sensor; capacitive; dual plate; noise immunity
- Citation
- IEEE SENSORS JOURNAL, v.14, no.2, pp 309 - 310
- Pages
- 2
- Journal Title
- IEEE SENSORS JOURNAL
- Volume
- 14
- Number
- 2
- Start Page
- 309
- End Page
- 310
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/12498
- DOI
- 10.1109/JSEN.2013.2288251
- ISSN
- 1530-437X
1558-1748
- Abstract
- 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-mu m process, and it occupies an area of 0.7 mm x 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 mu A with a resolution of 1% output frequency.
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