Title :
Preamplifier with a second-order high-pass filtering characteristic
Author :
Lin, Yue-Der ; Tsai, Chang-Da ; Huang, Hui-Hsun ; Chiou, Dah-Chuan ; Wu, Chien-Ping
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
5/1/1999 12:00:00 AM
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.
Keywords :
bioelectric potentials; biomedical electronics; high-pass filters; interference suppression; operational amplifiers; preamplifiers; biomedical circuit; chip fabrication; commercial operational amplifiers; differential high-pass filtering; high common-mode rejection ratio; high input impedance; instrumentation amplifier; low passive sensitivity; low-frequency interference suppression; phase margin; physiological signals measurement; second-order high-pass filtering characteristic; Circuits; Differential amplifiers; Filtering; Impedance; Instruments; Interference suppression; Operational amplifiers; Passive filters; Phase measurement; Preamplifiers; Electric Impedance; Equipment Design; Sensitivity and Specificity; Signal Processing, Computer-Assisted;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
