Preamplifier with a second-order high-pass filtering characteristic.
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.
Lin
Y D
YD
Department of Electrical Engineering, National Taiwan University, Taipei, R.O.C.
Tsai
C D
CD
Huang
H H
HH
Chiou
D C
DC
Wu
C P
CP
D017097:Electric Impedance; D004867:Equipment Design; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted