Programmable current source dedicated to a cochlear implant

Author

Ghorbel, Mohamed ; Hamida, A.B. ; Samet, Mounir

Author_Institution

Laboratoire d´´Electronique et des Technol. de l´´Information, Ecole Nat. d´´lngenieurs de Sfax, Tunisia

fYear

2004

fDate

2004

Firstpage

251

Lastpage

254

Abstract

In this paper, a novel architecture of a programmable current-source based on miniaturized digital-to-analog converters (DAC) was proposed. Such new design would be dedicated to cochlear implant circuit. In this study, our main objective was to look for one model that could include, as close as possible, several criteria related to the implant functionality such as reliability, flexibility, energy efficiency and integration area. Hence, this 6-bit DAC architecture was conceived in order to be adequate for a programmable current-source. Our design was able to generate a 2mA maximum current through a 1KΩ load, which is around the typical nerve impedance. Simulation results showed good linearity, low power consumption and a low area occupation. Resulting circuit was simulated by PSPICE tool using the 0.35μm CMOS technology.

Keywords

CMOS integrated circuits; circuit reliability; constant current sources; digital-analogue conversion; medical computing; programmable circuits; prosthetics; thermometers; 0.35 mum; 1 kohm; 2 mA; CMOS technology; cochlear implant circuit; digital-to-analog converters; energy efficiency; implant functionality; programmable current source; CMOS technology; Circuit simulation; Cochlear implants; Digital-analog conversion; Energy consumption; Energy efficiency; Impedance; Integrated circuit reliability; Linearity; SPICE;

fLanguage

English

Publisher

ieee

Conference_Titel

Control, Communications and Signal Processing, 2004. First International Symposium on

Print_ISBN

0-7803-8379-6

Type

conf

DOI

10.1109/ISCCSP.2004.1296272

Filename

1296272