AC instrumentation amplifier for bioimpedance measurements

Author

Pallás-Areny, Ramón ; Webster, John G.

Author_Institution

Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA

Volume

40

Issue

8

fYear

1993

Firstpage

830

Lastpage

833

Abstract

The input impedance and common-mode rejection ratio requirements for an amplifier for bioimpedance measurements are analyzed, considering the capacitive components of the electrode-skin contact impedance. An AC-coupled instrumentation amplifier that fulfills those requirements, and provides both interference and noise reduction and a zero phase shift over a wide frequency band without using broadband operational amplifiers, is described.

Keywords

amplifiers; bioelectric phenomena; biomedical electronics; biomedical measurement; electric impedance measurement; AC instrumentation amplifier; bioimpedance measurements; capacitive components; common-mode rejection ratio; electrode-skin contact impedance; input impedance; noise reduction; zero phase shift; Bioimpedance; Biomedical measurements; Broadband amplifiers; Circuits; Differential amplifiers; Frequency; Impedance measurement; Instruments; Interference; Noise reduction; Operational amplifiers; RNA; Voltage; Amplifiers; Animals; Electric Impedance; Electrophysiology; Equipment Design; Humans;

fLanguage

English

Journal_Title

Biomedical Engineering, IEEE Transactions on

Publisher

ieee

ISSN

0018-9294

Type

jour

DOI

10.1109/10.238470

Filename

238470