Indian Journal of Science and Technology
Year: 2016, Volume: 9, Issue: 16, Pages: 1-8
Fatemeh Karami Horestani1*, Mohammad Eshghi1 and Mohammadreza Yazdchi2
1Electrical and Computer Engineering faculty, Shahid Beheshti University, Tehran, Iran; [email protected] , [email protected] 2Biomedical Engineering Department, Faculty of Engineering, University of Isfahan, Isfahan, Iran; [email protected]
*Author of Corresponding: Fatemeh Karami Horestani Electrical and Computer Engineering faculty, Shahid Beheshti University, Tehran, Iran; [email protected]
Neural micro-probing not only allows us to access the brain signals, it is also one of the key tools to achieve a better understanding of the fundamental mechanisms of the brain and nervous system. This knowledge is extremely essential to implement complex neural prosthetics. Considering the importance of the size, power consumption, and accuracy, in this Paper, a compact, low-power eight-channel implantable neural recording microsystem is presented. To this end, Time Division Multiplexing (TDM) method is used for multiplexing 8 input channels. Thus, only one Analog to Digital Converter (ADC) block is used, resulting in a small circuit size and low power consumption. Also, a new structure of Amplitude-Shift Keying (ASK) modulation technique with simple configuration and low power consumption is proposed and applied. This system is designed in TSMC 0.18 μm CMOS technology with 1.8 V power supply and simulated with HSPICE. The total power consumption of the system is measured to 2 mW. Neural signals recorded from auditory cortex of a guinea pig are used as the inputs of the eight channels of the system. Total RMS error between inputs and outputs caused by the system is 2.8%.
Keywords: ASK Modulation, Implantable Microsystems, Multichannel Neural Recording, Time Division Multiplexing
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