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Title: Design and Optimization of a Low Power Pressure Sensor for Wireless Biomedical Applications
Authors: Montiel-Nelson, Juan A. 
Pulido, R.
Sosa, J. 
Garcia-Montesdeoca, Jose C. 
UNESCO Clasification: 3314 Tecnología médica
Keywords: Blood preasure
microelectromechanical system (MEMS)
CMOS technology
Power consumption
Issue Date: 2015
Publisher: 1687-725X
Journal: Journal of Sensors 
Abstract: 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 m CMOS technology. As result of the optimization, we obtained a digital sensor with high sensitivity, low noise (0.002 V/Hz), and low power consumption (358 W). 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.
ISSN: 1687-725X
DOI: 10.1155/2015/352036
Source: Journal of Sensors[ISSN 1687-725X],v. 2015 (352036)
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