915-MHz wireless 64-channel neural recording SoC with programmable mixed-signal FIR filters

Author

Abdelhalim, Karim ; Genov, Roman

Author_Institution

Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada

fYear

2011

fDate

12-16 Sept. 2011

Firstpage

223

Lastpage

226

Abstract

A system-on-chip (SoC) neural recording interface with 64 channels, 64 16-tap programmable mixed-signal FIR filters and a fully integrated 915MHz OOK/FSK closed-loop wireless transmitter is presented. Each recording channel has a fully differential amplifier with 54dB of gain and utilizes a tunable low-distortion subthreshold MOS-resistor to reject DC offsets with an input-referred noise of 6.5μV and a CMRR of 78dB. Each channel contains a modified 8-bit SAR ADC with an ENOB of 7.8-bits and can provide analog-digital multiplication by modifying the the sampling phase of the ADC. It is used in conjunction with 12-bit digital adders and registers to implement 64 programmable transposed FIR filters that enable precise separation of various bands in the neural spectrum. The 915MHz FSK/OOK transmitter offers data rates up to 1.5Mbps with a maximum output power of 0dBm. The 4×3mm chip fabricated in a 0.13μm CMOS process dissipates 5.03mW from a 1.2V supply.

Keywords

CMOS integrated circuits; FIR filters; UHF integrated circuits; adders; analogue-digital conversion; bioelectric potentials; biomedical electronics; mixed analogue-digital integrated circuits; patient diagnosis; patient monitoring; system-on-chip; CMOS process; OOK/FSK closed loop wireless transmitter; SAR ADC; analog-digital multiplication; digital adders; frequency 915 MHz; gain 54 dB; power 5.03 mW; programmable mixed signal FIR filters; programmable transposed FIR filters; sampling phase; size 0.13 mum; system-on-chip neural recording interface; voltage 1.2 V; wireless channel neural recording SoC; word length 12 bit; word length 7.8 bit; word length 8 bit; Finite impulse response filter; Frequency shift keying; Noise; Phase locked loops; System-on-a-chip; Transmitters; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC (ESSCIRC), 2011 Proceedings of the

Conference_Location

Helsinki

ISSN

1930-8833

Print_ISBN

978-1-4577-0703-2

Electronic_ISBN

1930-8833

Type

conf

DOI

10.1109/ESSCIRC.2011.6044947

Filename

6044947