Abstract
This paper presents a multi-channel analog front-end (AFE) for wearable dry EEG recording system. A novel AFE architecture is proposed to combine Time Division Multiplexing (TDM) together with chopping stabilization to improve the system-level common mode rejection ratio (CMRR) and the AFE input-referred noise. By utilizing TDM technique, single 2nd stage amplifier can be shared by multiple channels, leading to significant reduction in both power consumption and chip area. A 4-channel AFE prototype has been implemented in a standard 0.18-µm CMOS process. The post-layout simulation results show 0.62 µV rms input-referred noise integrated from 0.5 Hz to 100 Hz. The input impedance is boosted to 650 MΩ at 50 Hz by a tunable impedance boosting loop and the simulated intrinsic CMRR is 86 dB. The front-end only consumes 1.25 µW per channel under 1V supply voltage.
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