title: An Inductively-Powered Wireless Neural Recording System with a Charge Sampling Analog Front-End.
abstract: 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 mm2and consumed 51.4 mW. For each channel, the sampling rate is 21.48 kHz and the power consumption is 19.3 μW.In vivoexperiments 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).
authors.affiliation: GT-Bionics lab, School of Electrical and Computer Engineering at the Georgia Institute of Technology, Atlanta, GA 30308, USA.
authors.forename: Seung Bae
authors.initials: SB
authors.lastname: Lee
authors.affiliation: GT-Bionics lab, School of Electrical and Computer Engineering at the Georgia Institute of Technology, Atlanta, GA 30308, USA.
authors.forename: Byunghun
authors.initials: B
authors.lastname: Lee
authors.affiliation: GT-Bionics lab, School of Electrical and Computer Engineering at the Georgia Institute of Technology, Atlanta, GA 30308, USA.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Kiani
authors.affiliation: Department of Neurosurgery at Emory University.
authors.forename: Babak
authors.initials: B
authors.lastname: Mahmoudi
authors.affiliation: Department of Neurosurgery at Emory University.
authors.forename: Robert
authors.initials: R
authors.lastname: Gross
authors.affiliation: GT-Bionics lab, School of Electrical and Computer Engineering at the Georgia Institute of Technology, Atlanta, GA 30308, USA.
authors.forename: Maysam
authors.initials: M
authors.lastname: Ghovanloo
keywords: Wireless neural recording; dual-slope charge sampling; implantable medical devices; stimulus artifact rejection; wireless power transmission