Title :
A Wide Tuning Range CMOS Oscillator for an Optoelectronic Retinal Prosthesis System
Author :
Huang, Yan ; Drakakis, Emmanuel M. ; Toumazou, Chris
Author_Institution :
Dept. of Bioeng., Imperial Coll., London
Abstract :
This paper proposes a miniaturized optoelectronic system suitable for the optical stimulation of genetically engineered retinal ganglion cells (RGCs) and focuses upon the synthesis and performance characteristics of a key circuit component needed for the programmable stimulator chip of the system: a wide tuning range voltage-controlled oscillator (VCO). The paper elaborates the synthesis and performance of a novel OTA structure which is used for the realisation of the needed wide tuning range VCO. The VCO has been designed and fabricated in AMS 0.35mum CMOS technology. Simulation results reveal a tuning range of more than 6 decades (70mHz to 0.2MHz).
Keywords :
CMOS integrated circuits; biomedical electronics; eye; integrated optoelectronics; operational amplifiers; programmable circuits; prosthetics; voltage-controlled oscillators; 0.35 micron; CMOS technology; genetically engineered retinal ganglion cells; miniaturized optoelectronic system; operational transconductance amplifier; optical stimulation; optoelectronic retinal prosthesis system; programmable stimulator chip; voltage-controlled oscillator; wide tuning range CMOS oscillator; CMOS technology; Circuit optimization; Circuit synthesis; Genetic engineering; Optical devices; Optical tuning; Prosthetics; Retina; Stimulated emission; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.377933
