Title :
A high-sensitivity power-efficient limiting amplifier for bioimpedance phase angle detectors
Author :
Ausín, José L. ; Ramos, J. ; Duque-Carrillo, J.F. ; Torelli, Guido
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Extremadura, Badajoz, Spain
Abstract :
A power-efficient CMOS limiting amplifier to be used as a basic building block for bioelectrical impedance phase angle measuring devices is presented. The limiting amplifier is intended for use in a wearable device for malnutrition status assessment. A high-sensitivity limiting amplifier tolerant of process spreads and mismatches was fabricated in 0.35-μm CMOS technology. The circuit was designed to operate over a dc to 20 MHz bandwidth. Experimental results showed an input sensitivity of -65 dB and a power consumption of 560 μW from a 2-V supply.
Keywords :
CMOS integrated circuits; amplifiers; bioelectric potentials; biomedical electronics; biomedical equipment; limiters; power consumption; bioelectrical impedance phase angle measuring devices; bioimpedance phase angle detectors; frequency 20 MHz; high-sensitivity power-efficient limiting amplifier; malnutrition status assessment; noise figure -65 dB; power 560 muW; power consumption; power-efficient CMOS limiting amplifier; size 0.35 mum; voltage 2 V; wearable device; Bandwidth; Bioimpedance; Gain; Impedance; Limiting; Power demand; Sensitivity;
Conference_Titel :
Biomedical Circuits and Systems Conference (BioCAS), 2011 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4577-1469-6
DOI :
10.1109/BioCAS.2011.6107810
