An Integrated Low-Power Lock-In Amplifier and Its Application to Gas Detection

被引：21

作者：

Maya-Hernandez, Paulina M. ^{[1
]}

Alvarez-Simon, Luis C. ^{[1
]}

Teresa Sanz-Pascual, Mara ^{[1
]}

Calvo-Lopez, Belen ^{[2
]}

机构：

[1] INAOE, Dept Elect, Luis Enrique Erro 1, Tonantzintla 72840, Puebla, Mexico

[2] I3A, Fac Ciencias, Aragon Inst Engn Res, Grp Elect Design, Zaragoza 50009, Spain

来源：

SENSORS | 2014年 / 14卷 / 09期

关键词：

analog sensor conditioning; lock-in amplifier; phase-sensitive detection; gas sensing; portable applications; CMOS; CIRCUITS; SENSORS;

D O I：

10.3390/s140915880

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

This paper presents a new micropower analog lock-in amplifier (LIA) suitable for battery-operated applications thanks to its reduced size and power consumption as well as its operation with single-supply voltage. The proposed LIA was designed in a 0.18 mu m CMOS process with a single supply voltage of 1.8 V. Experimental results show a variable DC gain ranging from 24.7 to 42 dB, power consumption of 417 mu W and integration area of 0.013 mm(2). The LIA performance was demonstrated by measuring carbon monoxide concentrations as low as 1 ppm in dry N-2. The experimental results show that the response to CO of the sensing system can be considerably improved by means of the proposed LIA.

引用

页码：15880 / 15899

页数：20

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