A micropower front-end interface for differential-capacitive sensor systems

被引：6
|
作者：
Constandinou, Timothy G. [1 ,2 ]
Georgiou, Julius [1 ]
Toumazou, Chris [2 ]
机构：
[1] Univ Cyprus, ECE Dept, Holist Elect Res Lab, CY-1678 Nicosia, Cyprus
[2] Imperial Coll Sci, Inst Biomed Engn, London SW7 2AZ, England
来源：
PROCEEDINGS OF 2008 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-10 | 2008年
关键词：
capacitive sensor interface; integrate and fire; differential capacitance; dual slope converter; low power;
D O I：
10.1109/ISCAS.2008.4541957
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
This papers presents a front-end circuit for interfacing to differential capacitive sensors, including certain micro-electromechanical systems (MEMS). The system combines a self-resetting, biphasic integrator with a difference timer, producing a word parallel output representing the differential capacitance. The measurable capacitance range is tunable by means of an input current bias and system clock frequency. For an input bias of 10nA and system clock of 128KHz, the measurable capacitance range is +/-5pF (to 8 bit resolution) consuming below 26 mu W total system power.
引用
收藏
页码：2474 / +
页数：2
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