Lock-in amplifier for portable sensing systems

被引：33

作者：

Aguirre, J. ^{[1
]}

Medrano, N. ^{[1
]}

Calvo, B. ^{[1
]}

Celma, S. ^{[1
]}

机构：

[1] Univ Zaragoza, Grp Elect Design I3A, E-50009 Zaragoza, Spain

来源：

ELECTRONICS LETTERS | 2011年 / 47卷 / 21期

关键词：

D O I：

10.1049/el.2011.2472

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Presented is a 3 V single supply analogue lock-in amplifier designed for processing output sensor signals in highly noisy environments. The proposed amplifier uses square input signals instead of the usual sinusoidal signals, consequently allowing a straight interface with microcontroller-based sensing systems working with both resistive and capacitive transducers. Experimental results for noisy signals with DC voltage variation confirm the capability of the proposed solution to effectively recover information from signal-to-noise ratios down to -24 dB with errors below 6% and with an average power consumption of only 5 mW in full operation.

引用

页码：1172 / U27

页数：2

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