Title :
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
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;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
