作者
Paolo Mantenuto, Andrea De Marcellis, Giuseppe Ferri
发表日期
2014/1/17
期刊
IEEE Sensors Journal
卷号
14
期号
5
页码范围
1664-1672
出版商
IEEE
简介
In this paper, we propose novel fully analog uncalibrated readout circuits for wide-range capacitance estimation. The working principle is based on a modified De-Sauty ac bridge configuration where two capacitances and two resistances are employed. Through the use of a voltage controlled resistor and of a suitable feedback loop, an accurate estimation over a wide range of the sensor capacitance variation is possible, also without the knowledge of the other bridge component values. The first two proposed solutions are able to estimate, experimentally, ~1.5 decades (optimized range: [25-840 nF]) and more than 3 decades [900 pF-1.1 μF] of capacitive variations, respectively, ensuring, continuously, the bridge equilibrium condition; the third interface allows the evaluation of the sensor capacitance also outside this condition, increasing the capacitive variation decades to more than 4 [81 pF-1.1 μF]. The proposed …
学术搜索中的文章
P Mantenuto, A De Marcellis, G Ferri - IEEE Sensors Journal, 2014