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

作者：Alejandro Haberman Marcelo; Mario Spinelli Enrique

来源：IEEE Transactions on Biomedical Circuits and Systems, 2012, 6(6): 614-618.

DOI：10.1109/TBCAS.2012.2190733

• Biopotential amplifier
• biopotential front-end
• common-mode rejection ratio (CMRR)
• driven right leg (DRL) circuit
• multichannel EEG
• power line interference

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.

• 出版日期2012-12