Title :
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
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;
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
Print_ISBN :
0-7803-5674-8
DOI :
10.1109/IEMBS.1999.802463
