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Preamplifier with a second-order high-pass filtering characteristic

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5 Author(s)
Yue-Der Lin ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Chang-Da Tsai ; Hui-Hsun Huang ; Dah-Chuan Chiou
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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.

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Biomedical Engineering, IEEE Transactions on  (Volume:46 ,  Issue: 5 )