A 2.2μW 94nV/√Hz, Chopper-Stabilized Instrumentation Amplifier for EEG Detection in Chronic Implants

Author

Denison, Timothy ; Consoer, Kelly ; Kelly, Andy ; Hachenburg, April ; Santa, Wes

Author_Institution

Medtronic Neurological Technol., Columbia Heights, MN

fYear

2007

fDate

11-15 Feb. 2007

Firstpage

162

Lastpage

594

Abstract

A chopper-stabilized instrumentation amplifier is targeted for "deep-brain" human implants and consumes 2.2muW from a 1.8V supply. The integrated noise from 0.5 to 100 Hz is 0.94muV, providing a noise efficiency factor of 4.9. The use of chopper stabilization provides rail-to-rail inputs and 105dB CMRR. An integrated 0.5Hz HPF is used to suppress electrode offsets. The circuit is also used in micropower bridge interfaces for impedance measurement and pressure sensing.

Keywords

amplifiers; choppers (circuits); electroencephalography; instrumentation; prosthetics; 0.5 to 100 Hz; 0.94 muV; 1.8 V; 2.2 muW; EEG detection; chopper stabilization; chopper-stabilized instrumentation amplifier; chronic implants; deep-brain human implants; electrode offsets; impedance measurement; micropower bridge interfaces; pressure sensing; rail-to-rail input; Capacitors; Circuits; Electrodes; Electroencephalography; Feedback; Filters; Implants; Instruments; Low-noise amplifiers; Polarization;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2007. ISSCC 2007. Digest of Technical Papers. IEEE International

Conference_Location

San Francisco, CA

ISSN

0193-6530

Print_ISBN

1-4244-0853-9

Electronic_ISBN

0193-6530

Type

conf

DOI

10.1109/ISSCC.2007.373638

Filename

4242315