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Sensors 2015, 15(8), 19466-19486; doi:10.3390/s150819466

A High Performance Delta-Sigma Modulator for Neurosensing

1
Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
2
Department of Biomedical Engineering, University of Minnesota Twin Cities, Minneapolis, MN 55455, USA
3
Institute of VLSI Design, Zhejiang University, 38 Zheda Road, Xihu District, Hangzhou 310027, China
*
Author to whom correspondence should be addressed.
Academic Editors: Hung Cao and Yu Zhao
Received: 14 June 2015 / Revised: 30 July 2015 / Accepted: 4 August 2015 / Published: 7 August 2015
(This article belongs to the Special Issue Power Schemes for Biosensors and Biomedical Devices)
View Full-Text   |   Download PDF [1423 KB, uploaded 7 August 2015]   |  

Abstract

Recorded neural data are frequently corrupted by large amplitude artifacts that are triggered by a variety of sources, such as subject movements, organ motions, electromagnetic interferences and discharges at the electrode surface. To prevent the system from saturating and the electronics from malfunctioning due to these large artifacts, a wide dynamic range for data acquisition is demanded, which is quite challenging to achieve and would require excessive circuit area and power for implementation. In this paper, we present a high performance Delta-Sigma modulator along with several design techniques and enabling blocks to reduce circuit area and power. The modulator was fabricated in a 0.18-µm CMOS process. Powered by a 1.0-V supply, the chip can achieve an 85-dB peak signal-to-noise-and-distortion ratio (SNDR) and an 87-dB dynamic range when integrated over a 10-kHz bandwidth. The total power consumption of the modulator is 13 µW, which corresponds to a figure-of-merit (FOM) of 45 fJ/conversion step. These competitive circuit specifications make this design a good candidate for building high precision neurosensors. View Full-Text
Keywords: sensor interface; dynamic range; multi-bit quantizer; switched op-amp; Delta-Sigma modulator sensor interface; dynamic range; multi-bit quantizer; switched op-amp; Delta-Sigma modulator
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xu, J.; Zhao, M.; Wu, X.; Islam, M.K.; Yang, Z. A High Performance Delta-Sigma Modulator for Neurosensing. Sensors 2015, 15, 19466-19486.

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