AC instrumentation amplifier for bioimpedance measurements

1 January 1993

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Biomedical Engineering

Vol. 40 (8) , 830-833
https://doi.org/10.1109/10.238470

Abstract

We analyze the input impedance and CMRR requirements for an amplifier for bioimpedance measurements when considering the capacitive components of the electrode-skin contact impedance. We describe an ac-coupled instrumentation amplifier (IA) that, in addition to fulfilling those requirements, both provides interference and noise reduction, and yields a zero phase shift over a wide frequency band without using broadband op amps.

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

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