title: AC instrumentation amplifier for bioimpedance measurements.
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.
authors.affiliation: Department of Electrical and Computer Engineering, University of Wisconsin-Madison 53706.
authors.forename: R
authors.initials: R
authors.lastname: Pallás-Areny
authors.forename: J G
authors.initials: JG
authors.lastname: Webster
mesh_terms: D000669:Amplifiers, Electronic / Q000706:statistics & numerical data; D000818:Animals; D017097:Electric Impedance; D004594:Electrophysiology / Q000295:instrumentation / Q000706:statistics & numerical data; D004867:Equipment Design; D006801:Humans