Enabling closed-loop neural interface: A bi-directional interface circuit with stimulation artifact cancellation and cross-channel CM noise suppression

Author

Mendrela, Adam E. ; Jihyun Cho ; Fredenburg, Jeffrey A. ; Chestek, Cynthia A. ; Flynn, Michael P. ; Euisik Yoon

Author_Institution

Univ. of Michigan, Ann Arbor, MI, USA

fYear

2015

fDate

17-19 June 2015

Abstract

We present the first bi-directional neural interface chip that employs a stimulation artifact cancellation circuit to allow concurrent recording and stimulation. In order to further suppress cross-channel common-mode noise, we incorporated a novel common average referencing (CAR) circuit in conjunction with range-adapting (RA) SAR ADC for low-power implementation. The fabricated prototype attenuates stimulation artifacts by up to 42 dB and suppresses common noise among channels by up to 39.8 dB at 330 nW and in an area of 0.17 mm² per channel.

Keywords

analogue-digital conversion; integrated circuit noise; neural chips; reference circuits; CAR circuit; bidirectional interface circuit; bidirectional neural interface chip; closed-loop neural interface; common average referencing circuit; cross-channel CM noise suppression; cross-channel common-mode noise suppression; range-adapting SAR ADC; stimulation artifact cancellation circuit; successive approximation analog-digital converter; Digital filters; Electrodes; Electronics packaging; Gain; Noise; Preamplifiers; Prototypes;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Circuits (VLSI Circuits), 2015 Symposium on

Conference_Location

Kyoto

Print_ISBN

978-4-86348-502-0

Type

conf

DOI

10.1109/VLSIC.2015.7231342

Filename

7231342