An Energy-Efficient Readout Method for Piezoresistive Differential Pressure Sensors

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1 Citation (Scopus)

Abstract

This paper describes a low power and low noise circuit for resistive Wheatstone bridge sensor readout. The proposed readout exploits the bridge configuration of the sensor by embedding it into a second-order continuous-time sigma delta modulator (RC CTΔΣM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational transconductance amplifier (OTA) in the first integrator. The proposed readout is designed in a 0.35 μm CMOS technology. Simulation results show that it achieves an input referred noise power spectral density (PSD) of 4.2 nV/√Hz with a current consumption of 860 μA from a 5 V voltage supply. This represents a noise efficiency factor (NEF) of 4.7.
Original languageEnglish
Title of host publicationProceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society
Place of PublicationPiscataway, NJ
PublisherIEEE
Pages4287-4291
Number of pages5
ISBN (Electronic)978-1-5386-1127-2
DOIs
Publication statusPublished - 2017
EventIECON 2017: 43rd Annual Conference of the IEEE Industrial Electronics Society - China National Convention Center, Beijing, China
Duration: 29 Oct 20171 Nov 2017
Conference number: 43
http://iecon2017.csp.escience.cn/dct/page/1

Conference

ConferenceIECON 2017
CountryChina
CityBeijing
Period29/10/171/11/17
Internet address

Keywords

  • Wheatstone bridge
  • Energy-efficient
  • Low noise power density
  • Continuous time sigma delta modulator

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