Title :
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
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;
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
DOI :
10.1109/ECCTD.2011.6043343
