Title :
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
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;
Conference_Titel :
Solid-State Circuits Conference, 2007. ISSCC 2007. Digest of Technical Papers. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0853-9
Electronic_ISBN :
0193-6530
DOI :
10.1109/ISSCC.2007.373638
