Pressure sensor performance and reliability

Maudie, Theresa; Wertz, J.

doi:10.1109/2943.589894

Cited by 9 publications

(4 citation statements)

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“…Flexible electronics are attractive emerging technologies which have been integrated in wearable devices. , Particularly, flexible pressure sensors have been used extensively for controlling and monitoring thousands of systems in biomedical, environmental, household, space, and automotive fields, − important for present industrial advancements. Three predominant pressure-sensing technologies exist in the market, that is, capacitive, piezoelectric, and piezoresistive pressure sensors. − Among them, piezoresistive pressure sensors are the most typically employed because of their high sensitivity and low cost .…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Flexible Piezoresistive Pressure Sensors: Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Copolymers Blended with Graphene Oxide for Biomedical Applications

Wang

Karmakar²,

Lu³

et al. 2019

ACS Appl. Mater. Interfaces

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Piezoresistive pressure sensors have garnered significant attention because of their wide applications in automobiles, intelligent buildings, and biomedicine. For in vivo testing, the size of pressure sensors is a vital factor to monitor the pressure of specific portions of a human body. Therefore, the primary focus of this study is to miniaturize piezoresistive pressure sensors with graphene oxide (GO)-incorporated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite films on a flexible substrate for biomedical applications. Prior to the fabrication of pressure sensors, a comprehensive material analysis was applied to identify the horizontal placement of GO flakes within the PEDOT:PSS copolymers, revealing a reduction in variable range hopping distance and an enhancement in carrier mobility. For devices scaled to 0.2 cm, the sensitivity of PEDOT:PSS pressure sensors was conspicuously decreased owing to the late response, which can be effectively solved by GO incorporation. Using technology computer-aided design simulations, the current crowded at the PEDOT:PSS film surface and in the vicinity of an indium–tin–oxide electrode corner was found to be responsible for the changes in piezoresistive behaviors of the scaled devices. The miniaturized flexible piezoresistive pressure sensors with PEDOT:PSS/GO composite films are capable of monitoring the brain pressure of intracranial surgery of a rat and discerning different styles of music for a potential application in hearing aids.

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Section: Introductionmentioning

confidence: 99%

Miniaturized Flexible Piezoresistive Pressure Sensors: Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Copolymers Blended with Graphene Oxide for Biomedical Applications

Wang

Karmakar²,

Lu³

et al. 2019

ACS Appl. Mater. Interfaces

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“…Low power consump tion is a critical point to improve the distance between the wireless sensor and monitoring equipments and improve the battery life of the sensors, reducing at the same time the power radiated to establish the wireless communication. State of-the-art blood pressure transducers, based on four resis tors in a full Wheatstone bridge configuration, are usually optimized for sensitivity [1]- [3] and linearity. Temperature effect on sensitivity in silicon piezoresistive transducer has been studied in detail in [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

Low-power MEMS pressure sensor for wireless biomedical applications

García-Alonso

Bautista

Sosa

et al. 2011

2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS)

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Reducing power consumption leads to improve wireless sensor autonomy, increase battery life, and reduce radiated power. State-of-the-art blood pressure sensors based on piezoresistive transducers in a full Wheatstone bridge configura tion uses low ohmic values because high sensitivity and low noise approach. In this work, the piezoresistance values are increased in order to reduce one order of magnitude the power consumption.The noise introduced by this improvement was proved that does not limit the accuracy for 8-bit applications. Therefore, a low power consumption pressure sensor with high sensitivity and low noise is proposed. Power consumption versus sensitivity tradeoff is analyzed in detail. I. IN T RODUCTIONWireless blood pressure sensors are especially suitable for surgery rooms, intensive care or post-anesthetic recovery units, even small laboratory animals. Low power consump tion is a critical point to improve the distance between the wireless sensor and monitoring equipments and improve the battery life of the sensors, reducing at the same time the power radiated to establish the wireless communication. State of-the-art blood pressure transducers, based on four resis tors in a full Wheatstone bridge configuration, are usually optimized for sensitivity [1]-[3] and linearity. Temperature effect on sensitivity in silicon piezoresistive transducer has been studied in detail in [3]- [5]. Analysis of the noise in piezoresistive transducer has been presented in [5]. Most of the piezoresisitive transducer are ion-implanted into a thin silicon monocrystalline membrane. Ty pical values are in the range between 100 fl and 3 kfl, powered between 3 V and 5 V. This means a power consumption between 3 m W and 250 m W, typically 20 mW, only for the full Wheatstone bridge without the required signal conditioning circuit -a signal conditioning circuit with at least one operational amplifier is required.In this work, the piezoresistance ohmic values are increased in order to reduce the power consumption. It was proved that the noise introduced by this improvement does not limit the accuracy for 8-bit applications. The achieved power con sumption results are below 322 /-l W, including both the full Wheatstone bridge (62/-lW) and the signal conditioning sys tem, for a mixed signal technology of 1.0 /-lm CMOS process, including integrated sensors -XC 10 technology process from XFAB. This work proposes optimal tradeoff design points for piezoreslstlve transducer and sensor in terms of sensitivity, power consumption and noise. This paper is organized as follows. In Section II mechanical behavior of a diaphragm -pressure sensor-is analyzed in detail. In addition, the layout dimensions and positions of several piezoresistances -250, 500 and 1000 kfl-are calculated. The analysis of both sensitivity and power consumption of a full Wheatstone bridge and differential amplifier circuit to achieve optimum power and sensitivity design points is presented in Section m. Finally, conclusions are presented in Section IV. II. ELECTROMECHAN...

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“…State-of-the-art blood pressure transducers, based on four resistors in a full Wheatstone bridge configuration, are usually optimized for sensitivity [6][7][8][9][10][11][12][13][14] and linearity. Temperature effect on sensitivity in silicon piezoresistive transducer has been studied in detail in [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of a Low Power Pressure Sensor for Wireless Biomedical Applications

et al. 2015

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A blood pressure sensor suitable for wireless biomedical applications is designed and optimized. State-of-the-art blood pressure sensors based on piezoresistive transducers in a full Wheatstone bridge configuration use low ohmic values because of relatively high sensitivity and low noise approach resulting in high power consumption. In this paper, the piezoresistance values are increased in order to reduce by one order of magnitude the power consumption in comparison with literature approaches. The microelectromechanical system (MEMS) pressure sensor, the mixed signal circuits signal conditioning circuitry, and the successive approximation register (SAR) analog-to-digital converter (ADC) are designed, optimized, and integrated in the same substrate using a commercial 1 μm CMOS technology. As result of the optimization, we obtained a digital sensor with high sensitivity, low noise (0.002 μV/Hz), and low power consumption (358 μW). Finally, the piezoresistance noise does not affect the pressure sensor application since its value is lower than half least significant bit (LSB) of the ADC.

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Pressure sensor performance and reliability

Cited by 9 publications

References 0 publications

Miniaturized Flexible Piezoresistive Pressure Sensors: Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Copolymers Blended with Graphene Oxide for Biomedical Applications

Miniaturized Flexible Piezoresistive Pressure Sensors: Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Copolymers Blended with Graphene Oxide for Biomedical Applications

Low-power MEMS pressure sensor for wireless biomedical applications

Design and Optimization of a Low Power Pressure Sensor for Wireless Biomedical Applications

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