Title :
Fully-differential low-offset interface for capacitive sensors
Author :
Zhou, Kaimin ; Wang, Ziqiang ; Zhang, Chun ; Wang, ZhiHua
Author_Institution :
Inst. of Microelectron., Tsinghua Univ., Beijing, China
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%.
Keywords :
capacitive sensors; capacitors; baseline drift reduction; capacitive sensors; fully-differential capacitor measuring circuit; fully-differential low-offset interface; voltage 4 mV; Capacitance; Capacitance measurement; Capacitive sensors; Clocks; Linearity; Sensitivity; Capacitance-to-Voltage Converter (CVC); fully-differential; low baseline drift; low offset;
Conference_Titel :
Circuits and Systems (APCCAS), 2010 IEEE Asia Pacific Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-7454-7
DOI :
10.1109/APCCAS.2010.5774746
