An Inductively-Powered Wireless Neural Recording System with a Charge Sampling Analog Front-End.
An Inductively-Powered Wireless Neural Recording System with a Charge Sampling Analog Front-End.
复制标题
DOI：
10.1109/jsen.2015.2483747
复制
发表时间：
2016-01-15
影响因子：
4.3
通讯作者：
Ghovanloo M
中科院分区：
文献类型：
--
作者：
Lee SB;Lee B;Kiani M;Mahmoudi B;Gross R;Ghovanloo M
提出了一种感应供电的无线集成神经记录系统（WINeR-7），用于对无线供电的标准家庭笼内自由行为的动物受试者进行无线和无电池神经记录。 WINeR-7系统采用新颖的宽摆幅双斜率电荷采样（DSCS）模拟前端（AFE）架构，该架构能够以最小的干扰和较小的功耗执行放大、滤波、采样和模拟时间转换（ATC）。 DSCS-AFE 的输出产生伪数字脉宽调制 (PWM) 信号。循环移位寄存器 (CSR) 时分复用 (TDM) PWM 脉冲以创建 TDM-PWM 信号，该信号被馈送到片上 915 MHz 发射器 (Tx)。 AFE 和 Tx 分别由电源管理模块提供 1.8V 和 4.2V 电压，该模块包括高效有源整流器和自动谐振调谐 (ART)，工作频率为 13.56 MHz。 8通道片上系统（SoC）采用0.35μm CMOS工艺制造，占地5.0×2.5mm2，功耗51.4mW。每个通道的采样率为 21.48 kHz，功耗为 19.3 μW。通过以闭环方式向 WINeR-7 系统持续输送 51.4 mW 功率并记录局部场电位 (LFP)，对在通电的笼子中自由活动的大鼠进行体内实验。
An inductively-powered wireless integrated neural recording system (WINeR-7) is presented for wireless and battery less neural recording from freely-behaving animal subjects inside a wirelessly-powered standard homecage. The WINeR-7 system employs a novel wide-swing dual slope charge sampling (DSCS) analog front-end (AFE) architecture, which performs amplification, filtering, sampling, and analog-to-time conversion (ATC) with minimal interference and small amount of power. The output of the DSCS-AFE produces a pseudo-digital pulse width modulated (PWM) signal. A circular shift register (CSR) time division multiplexes (TDM) the PWM pulses to create a TDM-PWM signal, which is fed into an on-chip 915 MHz transmitter (Tx). The AFE and Tx are supplied at 1.8 V and 4.2 V, respectively, by a power management block, which includes a high efficiency active rectifier and automatic resonance tuning (ART), operating at 13.56 MHz. The 8-ch system-on-a-chip (SoC) was fabricated in a 0.35-μm CMOS process, occupying 5.0 × 2.5 mm2 and consumed 51.4 mW. For each channel, the sampling rate is 21.48 kHz and the power consumption is 19.3 μW. In vivo experiments were conducted on freely behaving rats in an energized homecage by continuously delivering 51.4 mW to the WINeR-7 system in a closed-loop fashion and recording local field potentials (LFP).