A Low-power Capacitance Measurement Circuit with High Resolution and High Degree of Linearity

被引：21

作者：

Haider, M. R. ^{[1
]}

Mahfouz, M. R. ^{[1
]}

Islam, S. K. ^{[1
]}

Eliza, S. A. ^{[1
]}

Qu, W. ^{[1
]}

Pritchard, E. ^{[1
]}

机构：

[1] Univ Tennessee, Knoxville, TN 37996 USA

来源：

2008 51ST MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 | 2008年

关键词：

low-power; capacitance measurement; read-out circuit; DIFFERENTIAL-CAPACITANCE; CONVERTER;

D O I：

10.1109/MWSCAS.2008.4616786

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper has presented a low-power capacitance read-out circuit which could be used for biomedical sensor applications. The differential structure of the system eliminates even order distortion. The entire system manifests two current sense amplifiers, two diode rectifiers and one Instrumentation amplifier. The circuit has been realized using TSMC 0.35 mu m bulk CMOS process. The circuit operates with a 3 V power supply and consumes 5.384 mW of power. Simulation results show that the circuit has a sensitivity of 1.32 mV for 1 fF capacitance change. Measurement results for different capacitance variations demonstrate a change of 10.8 mV for 8.8 fF variation.

引用

页码：261 / 264

页数：4

共 7 条

[1] A sensitive differential capacitance to voltage converter for sensor applications [J].