A fully-integrated 16-channel EEG readout front-end for neural recording applications |
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| Affiliation: | 1. Department of Electrical Engineering, School of Engineering, Ferdowsi University of Mashhad, Mashhad 9177948947, Iran;2. Integrated Circuits and Electronics Lab., Department of Engineering, Aarhus University, Aarhus 4189 3344, Denmark;1. Department of Telecommunications Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;2. Department of Engineering Education, Faculty of Industrial Education and Technology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;3. Department of Microelectronics, Brno University of Technology, Technická 10, Brno, Czech Republic;4. Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, Kladno, Czech Republic;1. Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;2. Integrated Circuits and Electronics Laboratory (ICE-LAB), Department of Engineering, Aarhus University, Denmark;1. Department of Physics, Electronics Laboratory, University of Patras, Patras, GR 26504, Greece;2. Department of Microelectronics, Brno University of Technology, Technická 10, Brno, Czech Republic;3. Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, Kladno, Czech Republic;1. Department of Electronics and Communication, Misr International University, Cairo, Egypt;2. Biomedical Engineering Department, Helwan University, Cairo, Egypt;3. Center of Nanoelectronics and Devices at Zewail City of Science and Technology/AUC, Cairo, Egypt |
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| Abstract: | In this paper, a power-efficient, low noise analog front-end (AFE) is presented which employs the chopper-stabilized technique. A new instrumentation amplifier structure leads to a high input impedance beyond 10 GΩ at the frequency of 10 Hz. Furthermore, an adaptive DC servo loop (DSL) is proposed which is conditionally activated to minimize the negative impact of this block on the noise performance of the AFE. The integrated input-referred noise of the amplifier is 1.33 µVrms and 1.19 µVrms over the 0.5 Hz–100 Hz frequency range when the DSL is enabled or disabled, respectively. Also, considering different aspects of the AFE, a new comprehensive figure of merit (FOM) is introduced to compare different state-of-the-art biopotential amplifiers. The power consumption and bandwidth of the designed 16-channel AFE are 15.81 µW and 235 Hz, respectively. The circuit is realized in the 180 nm standard complementary metal–oxide–semiconductor technology using a 1 V power supply. |
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| Keywords: | Dry electrodes Electroencephalography (EEG) Chopper modulation Adaptive DC servo loop (DSL) |
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