A 4x32-Channel Neural Recording System for Deep Brain Stimulation Systems

作者：Kim Susie; Na Seung In; Yang Youngtae; Kim Hyunjong; Kim Taehoon; Cho Jun Soo; Kim Jinhyung; Chang Jin Woo; Kim Suhwan

来源：Journal of Semiconductor Technology and Science, 2017, 17(1): 129-140.

DOI：10.5573/JSTS.2017.17.1.129

• Analog front-end (AFE)
• analog-to-digital converter (ADC)
• action potential (AP)
• 4x32-channel
• neural recording system

In this paper, a 4x32-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 midband 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 mVrms. 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.

• 出版日期2017-2-17