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A 1.5 mm2 4-Channel EEG/BIOZ Acquisition ASIC With 15.2-Bit 3-Step ADC Based on a Signal-Dependent Low-Power Strategy
- Source :
- IEEE Transactions on Biomedical Circuits and Systems; October 2023, Vol. 17 Issue: 5 p1111-1124, 14p
- Publication Year :
- 2023
-
Abstract
- This article presents a multichannel EEG/BIOZ acquisition application specific integrated circuit (ASIC) with 4 EEG channels and a BIOZ channel, a switch resistor low-pass filter (SR-LPF). Each EEG channel includes a frontend, and a 4-channel multiplexed analog-to-digital converter (ADC), while the BIOZ channel features a pseudo sine current generator and a pair of readout paths with multiplexed SR-LPF and ADC. The ASIC is designed for size and power minimization, utilizing a 3-step ADC with a novel signal-dependent low power strategy. The proposed ADC operates at a sampling rate of 1600 S/s with a resolution of 15.2 bits, occupying only 0.093 mm<superscript>2</superscript>. With the help of the proposed signal-dependent low-power strategy, the ADC's power dissipation drops from 32.2 μW to 26.4 μW, resulting in an 18% efficiency improvement without performance degradation. Moreover, the EEG channels deliver excellent noise performance with a NEF of 7.56 and 27.8 nV/√Hz at the expense of 0.16 mm<superscript>2</superscript> per channel. In BIOZ measurement, a 5-bit programmable current source is used to generate pseudo sine injection current ranging from 0 to 22 μApp, and the detection sensitivity reaches 2.4 mΩ/√Hz. Finally, the presented multichannel EEG/BIOZ acquisition ASIC has a compact active area of 1.5 mm<superscript>2</superscript> in an 180nm CMOS technology.
Details
- Language :
- English
- ISSN :
- 19324545
- Volume :
- 17
- Issue :
- 5
- Database :
- Supplemental Index
- Journal :
- IEEE Transactions on Biomedical Circuits and Systems
- Publication Type :
- Periodical
- Accession number :
- ejs65219300
- Full Text :
- https://doi.org/10.1109/TBCAS.2023.3301493