Integrated circuit for neural recording and stimulation

Author

Kursu, Olli ; Rahkonen, Timo

Author_Institution

Electron. Lab., Univ. of Oulu, Oulu, Finland

fYear

2014

fDate

27-28 Oct. 2014

Firstpage

1

Lastpage

4

Abstract

A 16 channel neural signal measurement and stimulation system is presented. All 16 channels can be used in a measurement setup that simultaneously both stimulates and measures neurons. The amplifying stage consists of 16 preamplifiers, a multiplexer and two post-amplifiers. The measured signal is digitized with a 10-bit SAR A/D converter. The circuit contains control logic for buffering the measured results and inserting them into a SPI-bus. The logic also controls the circuit´s bias currents, high-pass corner frequency, post-amplifier gains and stimulation current strengths. Amplifying gain can be configured from 100 to 5000. The mixed-signal circuit is implemented with 0.35 μm IC process by ams AG. The circuit is estimated to consume from 900 μW to 5 mW power, depending on the SPI-bus clock speed and amplifying gain.

Keywords

analogue-digital conversion; logic design; multiplexing equipment; neural chips; preamplifiers; 16 channel neural signal measurement; IC process; SAR A/D converter; SPI-bus clock speed; amplifying gain; amplifying stage; bias currents; control logic; high-pass corner frequency; integrated circuit; mixed-signal circuit; multiplexer; neural recording; neural stimulation; post-amplifier gains; post-amplifiers; power 900 muW to 5 mW; preamplifiers; size 0.35 mum; stimulation current strengths; stimulation system; word length 10 bit; Clocks; Integrated circuits; Multiplexing; Noise; Operational amplifiers; Power demand; Solid state circuits; neural signal measurement; neural signal stimulation;

fLanguage

English

Publisher

ieee

Conference_Titel

NORCHIP, 2014

Conference_Location

Tampere

Type

conf

DOI

10.1109/NORCHIP.2014.7004738

Filename

7004738