Low-voltage signal conditioning circuit for fluid-based inclination switch

Y. Matsumoto, A. M. Asrulnizam, K. Nakamura

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A low-voltage signal conditioning circuit for a capacitive sensor was designed with 0.35μm CMOS technology. A charge balanced capacitance detection circuit and summing amplifier were designed with inverter amplifier, feedback resistance and capacitance which determines the gain and frequency response ofthe circuit. The oscillator and hold capacitance were also integrated in the chip size of 1mm by 0.5mm. The chip was packaged with a fluid-based inclination switch on a ceramic substrate, and the characteristics were evaluated. A PDMS container of 4.0mm×4.0mm×2.0mm was used for the inclination switch. The output voltage was changed at angles of 0, 90, 180 and 270 deg with propylene carbonate used as an electrolyte.

Original languageEnglish
Title of host publication2008 IEEE Sensors, SENSORS 2008
Number of pages4
Publication statusPublished - 2008 Dec 1
Event2008 IEEE Sensors, SENSORS 2008 - Lecce, Italy
Duration: 2008 Oct 262009 Oct 29

Publication series

NameProceedings of IEEE Sensors


Other2008 IEEE Sensors, SENSORS 2008

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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