An accurate interface for capacitive sensors

被引：71

作者：

Li, XJ ^{[1
]}

Meijer, GCM ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Informat Technol & Syst, Delft, Netherlands

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2002年 / 51卷 / 05期

关键词：

capacitance measurement; capacitive sensors; oscillators;

D O I：

10.1109/TIM.2002.807793

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A new smart interface based on a first-order chargebalanced SC-oscillator is presented for capacitive sensors, which are shunted by a parasitic conductance. In the novel interface, the effect of shunting conductance is reduced by using the charge/discharge method. The effect of the stray capacitance is eliminated by using the two-port measurement. Moreover, all multiplicative and additive errors of the interface are also eliminated by using the auto-calibration technique and the chopping technique.

引用

页码：935 / 939

页数：5

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