AC instrumentation amplifier for bioimpedance measurements.
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.
Pallás-Areny
R
R
Department of Electrical and Computer Engineering, University of Wisconsin-Madison 53706.
Webster
J G
JG
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