Fully-differential low-offset interface for capacitive sensors

descriptionPublicationkeyboard_double_arrow_right Article , Conference object 01 Dec 2010Publisher:IEEEJournal:2010 IEEE Asia Pacific Conference on Circuits and Systems

Authors: Kaimin Zhou; Ziqiang Wang; Chun Zhang; Zhihua Wang 0001;

doi: 10.1109/apccas.2010.5774746

Fully-differential low-offset interface for capacitive sensors

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Abstract

A novel fully-differential capacitor measuring circuit is presented in this paper. Baseline drift is reduced by using a reference branch and the offsets of two op-amps are cancelled by each other. The simulation results show that linearity of this measuring circuit achieves 99.98%, baseline drift reduces to 4mV and sensitivity error between simulated result and theoretical calculated result is below 3%.

Related Organizations

Tsinghua University
China (People's Republic of)
Chinese Academy of Sciences
China (People's Republic of)
Institute of Microelectronics
China (People's Republic of)

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