Raúl Macías Macías, Miguel Ángel García González, Juan Ramos Castro, Ramon Bragós Bardia and Mireya Fernández Chimeno We expect to find potential applications in ambulatory monitoring and daily healthcare.Ĭontactless Electrical Bioimpedance System for Monitoring Ventilation - A Biodevice for Vehicle Environment This prototype is a pilot study aiming at integrating an innovative sphygmomanometry into a mobile phone for continuous blood pressure monitoring. The results show that 65.9% of estimated SBP fall into ±5% relative error, 96.6% in ☑0% and 99.7% in ☑5%. Performance of the prototype is examined by data from five healthy college students.
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Data communication between a mobile phone and the ambulatory monitor is conducted via a Bluetooth wireless connection. An oscillometric sphygmomanometer with a cuff is used to determine SBP intermittently for calibration purpose. Pulse arrival time (PAT) is derived from the apex of QRS complex to the maximum slope of PPG, and is used to estimate a rapid change component in SBP beat-by-beat.
Algorithms for signal processing, characteristic point detection and SBP estimation are implemented on a mobile phone. The ASIC is able to measure electrocardiogram (ECG), photoelectric plethysmogram (PPG), and has a peripheral interface to control an air pump and valve for inflating and deflating a sphygmomanometer cuff in conventional blood pressure measurement. This paper describes an ambulatory monitor for beat-by-beat monitoring of systolic blood pressure (SBP) based on an ASIC chip and a mobile phone. Wenxi Chen, Ming Huang, Xin Zhu, Kei-ichiro Kitamura and Tetsu Nemoto Power dissipation is 165μW and it occupies 0.0225mm2 of silicon area.īeat-by-Beat Monitoring of Systolic Blood Pressure based on an ASIC and a Mobile Phone for Ambulatory Application With an input signal bandwidth of 1kHz it achieves a SNDR of 61.2dB using an over-sampling ratio of 500. The modulator was designed using a commercial 0.18μm CMOS process with a supply voltage of 0.9V. This paper presents a low-voltage, low-power, 2nd order Sigma-Delta modulator for use in an electrochemical biosensor system. Low-power and low-voltage design is key in battery operated systems, and the size of the circuits need to be kept small such that arrays of sensors can be placed on each chip. These biosensors need small, low power, highly accurate sensors and analog to digital converters (ADCs) in order to generate chemical images of small tissue samples. Silicon biosensors are becoming increasingly popular for the study of cell growth and movement in biological systems.
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Full Papers Short Papers Full Papers Paper Nr:Ī 0.18µm CMOS 2nd Order Sigma-Delta Modulator for Low-power Biosensor Applications