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Title: A 50 μw/Ch artifacts-insensitive neural recorder using frequency-shaping technique
Authors: Xu, J.
Yang, Z. 
Issue Date: 7-Nov-2013
Citation: Xu, J.,Yang, Z. (2013-11-07). A 50 μw/Ch artifacts-insensitive neural recorder using frequency-shaping technique. Proceedings of the Custom Integrated Circuits Conference : -. ScholarBank@NUS Repository.
Abstract: This paper presents a frequency-shaping (FS) neural recording interface that can inherently reject electrode offset, 5-10 times increase input impedance, 4.5-bit extend system dynamic range (DR), and provide much more tolerance to motion artifacts and 50/60 Hz power noise interferences. It is supposed to be more suitable for long-term brain-machine-interface (BMI) experiments. To achieve the mentioned performance above, the proposed architecture adopts an auto-zero offset calibration to avoid system saturation, a delayed-signaling noise cancellation to attenuate kT/C noise, and an automatical data-splitting technique to reduce input-referred noise at low frequencies. Measured at a 40 kHz sampling clock and ± 0.6 V supply, the recorder consumes 50 μW/ch, including 22 μW for FS amplifier, 12 μW for gain-stage amplifier, 12 μW for buffer, and 4 μW for successive approximation register (SAR) analog-to-digital converter (ADC). The designed SAR ADC achieves an effective-number-of-bit (ENOB) of 11-bit in a 160 kHz bandwidth. In addition, the recorder has a 3 pF input capacitance and 15.5-bit (11-bit+4.5-bit) system DR due to the utilization of FS technique. The designed chip occupies 0.76 mm2/ch in a 0.13 μm CMOS process. © 2013 IEEE.
Source Title: Proceedings of the Custom Integrated Circuits Conference
ISBN: 9781467361460
ISSN: 08865930
DOI: 10.1109/CICC.2013.6658532
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