Modulation/demodulation system for capacitive sensors

被引：0
|
作者：
Chou, Wen-Chieh [1 ]
Hsu, Yu-Chun [1 ]
Liao, Lu-Po [1 ]
机构：
[1] Ind Technol Res Inst, 195 Chung Hsing Rd,Sec 4, Hsinchu 31015, Taiwan
来源：
2006 INTERNATIONAL MICROSYSTEMS, PACKAGING, ASSEMBLY CONFERENCE TAIWAN (IMPACT), PROCEEDINGS | 2006年
关键词：
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A modulation / demodulation system which is suitable for capacitive sensor signal processing is proposed. A capacitive sensor has very weak output signal which requires preamplification prior to any further processing. The unavoidable 1/f noises [2] of the MOSFETs in the electronic circuit often eat away the signal from the sensor, which make the signal not readable. To overcome this problem, a modulation / demodulation system is proposed to modulate the 1/f noise to a higher frequency and then been low-pass filtered. The result shows that the circuit suffers an equivalent input noise of 468nV/rt Hz and has a THD of 0.6% with 5mW power consumption.
引用
收藏
页码：61 / +
页数：3
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