A wireless multi-channel implantable neural recording microsystem based on optimized analog TDM-FDM combination |
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| Institution: | 1. Department of Electrical Engineering, Bojnourd Branch, Islamic Azad University, Bojnourd, Iran;2. Department of Electrical Engineering, University of Bojnord, Bojnord, Iran;1. Department of Electronic Engineering, National I-Lan University, Yi-Lan 26041, Taiwan, ROC;2. Department of Information Management, St. Mary’s Junior College of Medicine, Nursing and Management, Yi-Lan 26644, Taiwan, ROC;1. Institute of Information and Communication Engineering, Zhejiang Provincial Key Laboratory of Information Processing, Communication and Networking, Zhejiang University, Hangzhou 310027, China;2. Central Research Institute, Huawei Technologies Co., Ltd., Hangzhou 310052, China;1. Department of Electrical Engineering, Technical University of Cz?stochowa, 42-201 Cz?stochowa, Poland;2. Department of Microelectronics, Brno University of Technology, Technická 10, Brno, Czech Republic;3. Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, Kladno, Czech Republic;1. Department of Information Management, Junior College of Medicine, Nursing and Management, I-Lan, Taiwan;2. Department of Electronic Engineering, National I-Lan University, I-Lan, Taiwan;1. Institute of Acoustics, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China;3. Zhejiang Wanli University, Ningbo, China;4. University of Nebraska-Lincoln, Omaha, USA |
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| Abstract: | Crosstalk noise (CT) is a limiting factor to increase the number of channels in analog Time-Division-Multiplexing (TDM)-based Wireless Neural Recording microsystems (WNRs). This paper proposes a novel approach to mitigate and decrease the effect of the CT by combining TDM with Frequency-Division-Multiplexing (FDM). In particular, we evaluate some possible configurations of the TDM-FDM combination and present a system that has less CT than other configurations. A 12-channel WNR based on the proposed system is designed in both system and circuit-level. In this system, channels are first divided into three 4-channel groups and after multiplexing in time domain, they are combined together with FDM method. While the group containing the marker pulse is located in the base-band, the second and third group are shifted to the frequency domain by employing quadrature modulation. The circuit-level of the system is designed and simulated by using 0.18 μm CMOS technology. The designed circuit consumes a power of 1.4 mW at a supply voltage of 1.8 V. The performance of the proposed system is also compared with simple TDM-based WNR. Simulations shows that in the proposed system the CT is considerably decreased. |
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| Keywords: | CMOS Crosstalk noise Frequency-Division Multiplexing Time-Division Multiplexing Wireless implantable neural recording |
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