A new dc baseline stabilization scheme for neural recording microprobes

Author

Chandran, Arjun P. ; Najafi, Khalil ; Wise, Kensall D.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA

Volume

1

fYear

1999

fDate

1999

Abstract

This paper presents a novel circuit methodology for rejecting the random DC drift associated with recording microelectrodes. In this approach, a sub-threshold front end MOS transistor is used as a voltage variable resistor to clamp the large, and random DC drifts at the recording site without sacrificing AC performance. A CMOS amplifier utilizing this front-end stage (along with DC common mode feedback) has been fabricated. The amplifier measures 0.18 sq. mm and has a closed loop gain of 41 dB with a power consumption of 150 μW. The system provides -30 dB of DC attenuation, and has a CMRR of 35 dB

Keywords

biomedical electrodes; biomedical electronics; microelectrodes; neurophysiology; 150 muW; 41 dB; CMOS amplifier; CMRR; DC baseline stabilization; DC common mode feedback; MOS transistor; closed loop gain; front-end circuit; microelectrode; neural recording microprobe; power consumption; random DC drift attenuation; voltage variable resistor; Circuits; Gain; MOSFETs; Optical amplifiers; Optical attenuators; Optical feedback; Optical filters; Optical recording; Resistors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint

Conference_Location

Atlanta, GA

ISSN

1094-687X

Print_ISBN

0-7803-5674-8

Type

conf

DOI

10.1109/IEMBS.1999.802463

Filename

802463