16-channel Wireless Implantable Neural Recording Microsystems Based on Frequency-division Multiplexing

Rajabi Tavakkol, Alireza; Delshadi, Ali

doi:10.48301/jear.2024.459244.1029

16-channel Wireless Implantable Neural Recording Microsystems Based on Frequency-division Multiplexing

Document Type : Original Article

Authors

Alireza Rajabi Tavakkol

Ali Delshadi

MSc, Department of Electrical Engineering, National University of Skills (NUS), Tehran, Iran.

10.48301/jear.2024.459244.1029

Abstract

In the present paper, a 16-channel implantable wireless neural recording system is presented. The proposed system employs frequency-division multiplexing (FDM) to transfer multiple neural channels to an external setup wirelessly. The main advantage of the proposed system is that, while increasing the number of channels, it efficiently utilizes the limited bandwidth allocated for wireless data transmission such as the 402-405 MHz, 174-216 MHz, or 88-108 MHz bands allocated for medical implant communication services. In this system, neural activities from multiple channels are detected using two-dimensional or three-dimensional microelectrodes. After preconditioning, the multiple parallel channels are multiplexed in the frequency domain within the FDM module. As a result of FDM, preconditioned neural signals are placed in the frequency domain with 100kHz spacing, occupying a 1600kHz bandwidth starting from 10MHz. Finally, the resulting FDM band is shifted in the frequency domain by the frequency modulation (FM) block with a carrier frequency of 100 MHz. A 16-channel prototype system is designed and simulated using 0.18 µm CMOS technology, with a chip area of 0.55 × 0.58 mm²and a power consumption of 3.35 mW at a supply voltage of 1.8V.

Keywords

Microsystem

Neural Recording

Implantable

Frequency Division Multiplexing

Subjects

Electrical Engineering

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