A 200 μW Eight-Channel EEG Acquisition ASIC for Ambulatory EEG Systems
Top Cited Papers
- 12 December 2008
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 43 (12), 3025-3038
- https://doi.org/10.1109/jssc.2008.2006462
Abstract
The growing interest toward the improvement of patients' quality of life and the use of medical signals in nonmedical applications such as entertainment, sports, and brain-computerinterfaces, requires the implementation of miniaturized and wireless biopotential acquisition systems with ultralow power dissipation. Therefore, this paper presents the implementation of a complete EEG acquisition ASIC tailored towards the needs of such applications, i.e., high-signal quality, low-power dissipation and ease of use. The presented ASIC includes eight readout front-end channels and an 11-bit analog-to-digital converter (ADC). The key to its high performance and low-power dissipation is the new AC coupled chopper stabilized instrumentation amplifier (ACCIA) implementation that uses a coarse-fine servoloop and reaches more than 120 dB CMRR, consumes only 2.3 muA , and achieves a noise-efficiency factor (NEF) of 4.3. Furthermore, the ease of use of the ASIC is realized by incorporating Calibration and Electrode Impedance Measurement Modes to the ASIC. Therefore, the former can be used to check the functionality of the ASIC, as well as, to calibrate the gain matching of the channels, where as the latter can be used to track the quality of the biopotential electrode. The ASIC is implemented in 0.5 mum CMOS process and the total current consumption is 66 muA from 3 V.Keywords
This publication has 16 references indexed in Scilit:
- A fully-integrated bandpass amplifier for extracellular neural recordingPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- A low-power low-noise cmos for amplifier neural recording applicationsIEEE Journal of Solid-State Circuits, 2003
- 12-bit low-power fully differential switched capacitor noncalibrating successive approximation ADC with 1 MS/sIEEE Journal of Solid-State Circuits, 2001
- Distortion analysis of MOS track-and-hold sampling mixers using time-varying Volterra seriesIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1999
- Circuit techniques for reducing the effects of op-amp imperfections: autozeroing, correlated double sampling, and chopper stabilizationProceedings of the IEEE, 1996
- High-quality recording of bioelectric eventsMedical & Biological Engineering & Computing, 1990
- A 4-MHz CMOS continuous-time filter with on-chip automatic tuningIEEE Journal of Solid-State Circuits, 1988
- A 100-MHz pipelined CMOS comparatorIEEE Journal of Solid-State Circuits, 1988
- A micropower low-noise monolithic instrumentation amplifier for medical purposesIEEE Journal of Solid-State Circuits, 1987
- A segmented μ-255 law PCM voice encoder utilizing NMOS technologyIEEE Journal of Solid-State Circuits, 1976