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

fYear

2011

fDate

10-12 Nov. 2011

Firstpage

393

Lastpage

396

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Circuits and Systems Conference (BioCAS), 2011 IEEE

Conference_Location

San Diego, CA

Print_ISBN

978-1-4577-1469-6

Type

conf

DOI

10.1109/BioCAS.2011.6107810

Filename

6107810