OpAmp design for lock-in amplifiers in portable sensing systems

M. R. Valero, Santiago Celma-Pueyo, N. Medrano, B. Calvo

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

8 Citations (Scopus)

Abstract

This paper presents a 1.2 V low-power rail-to-rail class AB operational amplifier (OpAmp) suitable for integrated lock-in amplifiers. The proposed OpAmp has been designed in a standard 0.18 μm CMOS technology. For a 1.2 V single supply and 81 μW power consumption, simulations shows a 86 dB open loop gain, 56 phase margin, 17 MHz unity gain frequency with 1 pF load and 97 dB CMRR. Adaptive biasing provides 33 V/μs slew-rate for a 1 pF capacitive load. A compact and reliable lock-in amplifier (LIA) has been designed using the proposed circuit. Post-layout results for noisy signals confirm the capability of the LIA to effectively recover information from signal-to-noise ratios down to -26 dB with errors below 4.2% up to 50 kHz and a power consumption of only 675 μW.

Original languageEnglish
Title of host publication2013 European Conference on Circuit Theory and Design, ECCTD 2013 - Proceedings
PublisherIEEE Computer Society
ISBN (Print)9783000437854
DOIs
Publication statusPublished - 1 Jan 2013
Event2013 European Conference on Circuit Theory and Design, ECCTD 2013 - Dresden, Germany
Duration: 8 Sep 201312 Sep 2013

Publication series

Name2013 European Conference on Circuit Theory and Design, ECCTD 2013 - Proceedings

Conference

Conference2013 European Conference on Circuit Theory and Design, ECCTD 2013
CountryGermany
CityDresden
Period8/09/1312/09/13

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