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A Multichannel EEG Acquisition Scheme Based on Single Ended Amplifiers and Digital DRL

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2 Author(s)
Haberman, M.A. ; Dto. Electrotecnia, UNLP, La Plata, Argentina ; Spinelli, E.M.

Single ended (SE) amplifiers allow implementing biopotential front-ends with a reduced number of parts, being well suited for preamplified electrodes or compact EEG headboxes. On the other hand, given that each channel has independent gain; mismatching between these gains results in poor common-mode rejection ratios (CMRRs) (about 30 dB considering 1% tolerance components). This work proposes a scheme for multichannel EEG acquisition systems based on SE amplifiers and a novel digital driven right leg (DDRL) circuit, which overcome the poor CMRR of the front-end stage providing a high common mode reduction at power line frequency (up to 80 dB). A functional prototype was built and tested showing the feasibility of the proposed technique. It provided EEG records with negligible power line interference, even in very aggressive EMI environments.

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Biomedical Circuits and Systems, IEEE Transactions on  (Volume:6 ,  Issue: 6 )