An improved CMOS current driver for electrical impedance tomography

Author

Constantinou, Loucas ; Demosthenous, Andreas ; Langlois, Peter ; Bayford, Richard ; Triantis, Iasonas

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. Coll. London, London, UK

fYear

2011

Firstpage

290

Lastpage

293

Abstract

Bioelectrical impedance measurements can be used in a wide range of clinical applications for monitoring and tissue characterization. Bioimpedance measurement applications need current drivers with high output impedance and stable current injection in the frequencies from DC to about 10 MHz. This paper presents an improved current driver based on a pair of balanced operational transconductance amplifiers (OTAs) using a negative feedback loop to provide over 1 MΩ output impedance ranging from DC to about 5 MHz. The circuit has been designed and simulated using XFAB 0.6-μm CMOS high voltage transistor models with ±9V power supplies. Simulated results are presented.

Keywords

CMOS integrated circuits; biological tissues; driver circuits; electric impedance imaging; electric impedance measurement; patient monitoring; CMOS current driver; XFAB CMOS high voltage transistor model; balanced operational transconductance amplifiers; bioelectrical impedance measurement; bioimpedance measurement application; clinical applications; electrical impedance tomography; negative feedback loop; size 0.6 mum; tissue characterization; Impedance; Resistance; Resistors; Tomography; Transconductance; Transistors; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuit Theory and Design (ECCTD), 2011 20th European Conference on

Conference_Location

Linkoping

Print_ISBN

978-1-4577-0617-2

Electronic_ISBN

978-1-4577-0616-5

Type

conf

DOI

10.1109/ECCTD.2011.6043343

Filename

6043343