A high output impedance CMOS current driver for bioimpedance measurements

Author

Hong, Hongwei ; Demosthenous, Andreas ; Triantis, Iasonas F. ; Langlois, Peter ; Bayford, Richard

Author_Institution

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

fYear

2010

fDate

3-5 Nov. 2010

Firstpage

230

Lastpage

233

Abstract

Advances in bioimpedance measurement applications need current drivers with high output impedance in the frequencies ranging from DC to a number of MHz. In particular, it needs greater than 10 MΩ output impedance at low frequencies, e.g., 10 kHz. This paper presents an current driver based on operational transconductance amplifiers (OTAs) using a feedback loop to provide over 10 MΩ output impedance ranging from DC to 10 kHz and 1 MΩ at 1 MHz. In addition, a stable performance over a wide frequency range (<;4 MHz) is simulated. The circuit has been designed in a 0.6-μm CMOS process using ±2.5 V power supplies. Simulated results are presented.

Keywords

CMOS integrated circuits; bioelectric phenomena; biomedical measurement; electric impedance imaging; feedback; operational amplifiers; CMOS process; OTA; bioimpedance measurements; feedback loop; frequency 0 kHz to 10 kHz; frequency 1 MHz; high output impedance CMOS current driver; operational transconductance amplifiers; resistance 1 Mohm; voltage 2.5 V; Capacitance; Driver circuits; Immune system; Impedance; Integrated circuit modeling; Tomography; Transconductance;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Circuits and Systems Conference (BioCAS), 2010 IEEE

Conference_Location

Paphos

Print_ISBN

978-1-4244-7269-7

Electronic_ISBN

978-1-4244-7268-0

Type

conf

DOI

10.1109/BIOCAS.2010.5709613

Filename

5709613