An 8-Channel Biomedical Front-End (BFE) with 6.2-μW Per Channel for EEG/ECoG Acquisition

Abstract

This paper presents the design of a low power biomedical front-end (BFE) for Electroencephalogram (EEG)/Electrocorticography (ECoG) acquisition applications through 0.18 $\mu m$ CMOS process. By balancing the design constrains of total input-referred noise of the BFE, gain and power of multi-channel LNAs, and resolution of the ADC, the BFE achieves power consumption of 6.2 $\mu W$ per channel, for an 8-channel design. In addition, a 12-bit SAR ADC with data weighted averaging (DWA) calibrations is proposed to alleviate the design burdens in the low noise amplifier (LNA).