title: Preamplifier with a second-order high-pass filtering characteristic.
abstract: A new preamplifier for suppressing low-frequency interference is presented. The proposed preamplifier, with its front end being implemented by an instrumentation amplifier, enjoys the following advantages: differential high-pass filtering, high input impedance, high common--mode rejection ratio and low passive sensitivity. This circuit can be realized with commercial operational amplifiers with enough phase margin, or fabricated in a chip for practical measurement of physiological signals.
authors.affiliation: Department of Electrical Engineering, National Taiwan University, Taipei, R.O.C.
authors.forename: Y D
authors.initials: YD
authors.lastname: Lin
authors.forename: C D
authors.initials: CD
authors.lastname: Tsai
authors.forename: H H
authors.initials: HH
authors.lastname: Huang
authors.forename: D C
authors.initials: DC
authors.lastname: Chiou
authors.forename: C P
authors.initials: CP
authors.lastname: Wu
mesh_terms: D017097:Electric Impedance; D004867:Equipment Design; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted