New stray-immune interface circuit for capacitive sensors

被引：0
|
作者：
Cao, Xinping [1 ]
Zhang, Dacheng [1 ]
Huang, Ru [1 ]
Zhang, Xing [1 ]
Wang, Yangyuan [1 ]
机构：
[1] Inst. of Microelectron., Peking Univ., Beijing 100871, China
来源：
| 2002年 / Science Press卷 / 23期
关键词：
Capacitance - Charge transfer devices - Design - Instrument circuits;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A novel interface circuit is presented to detect the minimal change of the differential capacitance. Based on the charge transfer circuit, the interface circuit introduces another charge transfer circuit detecting the reference differential capacitance. By differentially amplifying the output of the detecting and reference circuit, the interface circuit shows better stability and much higher sensitivity. At the same time, it keeps the characteristic of high immunity to parasitic capacitance.
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