[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5573/JSTS.2017.17.1.129

A 4×32-Channel Neural Recording System for Deep Brain Stimulation Systems

Kim, Susie (Department of Electrical and Computer Engineering, Seoul National University)
Na, Seung-In (System LSI, Semiconductor Business Group, Samsung Electronics Co. Ltd.)
Yang, Youngtae (Department of Electrical and Computer Engineering, Seoul National University)
Kim, Hyunjong (Department of Electrical and Computer Engineering, Seoul National University)
Kim, Taehoon (Department of Electrical and Computer Engineering, Seoul National University)
Cho, Jun Soo (Department of Electrical and Computer Engineering, Seoul National University)
Kim, Jinhyung (Department of Neurosurgery, Yonsei University College of Medicine)
Chang, Jin Woo (Department of Neurosurgery, Yonsei University College of Medicine)
Kim, Suhwan (Department of Electrical and Computer Engineering, Seoul National University)

Publication Information

JSTS:Journal of Semiconductor Technology and Science / v.17, no.1, 2017 , pp. 129-140 More about this Journal

Abstract

In this paper, a $4{\times}32$ -channel neural recording system capable of acquiring neural signals is introduced. Four 32-channel neural recording ICs, complex programmable logic devices (CPLDs), a micro controller unit (MCU) with USB interface, and a PC are used. Each neural recording IC, implemented in $0.18{\mu}m$ CMOS technology, includes 32 channels of analog front-ends (AFEs), a 32-to-1 analog multiplexer, and an analog-to-digital converter (ADC). The mid-band gain of the AFE is adjustable in four steps, and have a tunable bandwidth. The AFE has a mid-band gain of 54.5 dB to 65.7 dB and a bandwidth of 35.3 Hz to 5.8 kHz. The high-pass cutoff frequency of the AFE varies from 18.6 Hz to 154.7 Hz. The input-referred noise (IRN) of the AFE is $10.2{\mu}V_{rms}$ . A high-resolution, low-power ADC with a high conversion speed achieves a signal-to-noise and distortion ratio (SNDR) of 50.63 dB and a spurious-free dynamic range (SFDR) of 63.88 dB, at a sampling-rate of 2.5 MS/s. The effectiveness of our neural recording system is validated in in-vivo recording of the primary somatosensory cortex of a rat.

Keywords

Analog front-end (AFE); analog-to-digital converter (ADC); action potential (AP); $4{\times}32$ -channel; neural recording system;

Citations & Related Records

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