A Power-Efficient Readout for Wheatstone-Bridge Sensors With COTS Components

Hui Jiang; Johan G. Vogel; Stoyan Nihtianov

doi:10.1109/JSEN.2017.2755074

A Power-Efficient Readout for Wheatstone-Bridge Sensors With COTS Components

Hui Jiang, Johan G. Vogel, Stoyan Nihtianov

Electronic Instrumentation

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8 Citations (Scopus)

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Abstract

This paper presents a direct digital converter for Wheatstone bridge sensors, which is realized with commercial off-the-shelf components. The power efficiency of the readout is enhanced by embedding the bridge sensor in a second-order continuous-time sigma-delta modulator (CTDeltaSigmaM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational amplifier in the first integrator and the bridge sensor. To demonstrate the performance of the proposed circuit, an MEMS piezoresistive differential pressure sensor is used. Measurement results show that a resolution of 12.7 mParms (0.41 mOhmrms), with a 0.5-ms conversion time, can be achieved. Powered by 5 V, the circuit and the bridge sensor draw 9.55 and 7.58 mW, respectively.

Original language	English
Pages (from-to)	6986-6994
Number of pages	9
Journal	IEEE Sensors Journal
Volume	17
Issue number	21
DOIs	https://doi.org/10.1109/JSEN.2017.2755074
Publication status	Published - 2017

Bibliographical note

Accepted Author Manuscript

Keywords

Direct digital converter
bridge sensor readout
continuous-time sigma-delta modulator
mPa-level differential pressure sensing

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10.1109/JSEN.2017.2755074

36831711Accepted author manuscript, 1.28 MBLicence: CC BY-NC-ND

Cite this

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title = "A Power-Efficient Readout for Wheatstone-Bridge Sensors With COTS Components",

abstract = "This paper presents a direct digital converter for Wheatstone bridge sensors, which is realized with commercial off-the-shelf components. The power efficiency of the readout is enhanced by embedding the bridge sensor in a second-order continuous-time sigma-delta modulator (CTDeltaSigmaM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational amplifier in the first integrator and the bridge sensor. To demonstrate the performance of the proposed circuit, an MEMS piezoresistive differential pressure sensor is used. Measurement results show that a resolution of 12.7 mParms (0.41 mOhmrms), with a 0.5-ms conversion time, can be achieved. Powered by 5 V, the circuit and the bridge sensor draw 9.55 and 7.58 mW, respectively.",

keywords = "Direct digital converter, bridge sensor readout, continuous-time sigma-delta modulator, mPa-level differential pressure sensing",

author = "Hui Jiang and Vogel, {Johan G.} and Stoyan Nihtianov",

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T1 - A Power-Efficient Readout for Wheatstone-Bridge Sensors With COTS Components

AU - Jiang, Hui

AU - Vogel, Johan G.

AU - Nihtianov, Stoyan

N1 - Accepted Author Manuscript

PY - 2017

Y1 - 2017

N2 - This paper presents a direct digital converter for Wheatstone bridge sensors, which is realized with commercial off-the-shelf components. The power efficiency of the readout is enhanced by embedding the bridge sensor in a second-order continuous-time sigma-delta modulator (CTDeltaSigmaM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational amplifier in the first integrator and the bridge sensor. To demonstrate the performance of the proposed circuit, an MEMS piezoresistive differential pressure sensor is used. Measurement results show that a resolution of 12.7 mParms (0.41 mOhmrms), with a 0.5-ms conversion time, can be achieved. Powered by 5 V, the circuit and the bridge sensor draw 9.55 and 7.58 mW, respectively.

AB - This paper presents a direct digital converter for Wheatstone bridge sensors, which is realized with commercial off-the-shelf components. The power efficiency of the readout is enhanced by embedding the bridge sensor in a second-order continuous-time sigma-delta modulator (CTDeltaSigmaM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational amplifier in the first integrator and the bridge sensor. To demonstrate the performance of the proposed circuit, an MEMS piezoresistive differential pressure sensor is used. Measurement results show that a resolution of 12.7 mParms (0.41 mOhmrms), with a 0.5-ms conversion time, can be achieved. Powered by 5 V, the circuit and the bridge sensor draw 9.55 and 7.58 mW, respectively.

KW - Direct digital converter

KW - bridge sensor readout

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KW - mPa-level differential pressure sensing

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M3 - Article

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EP - 6994

JO - IEEE Sensors Journal

JF - IEEE Sensors Journal

IS - 21

ER -

A Power-Efficient Readout for Wheatstone-Bridge Sensors With COTS Components

Abstract

Bibliographical note

Keywords

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