A 2 μW, 95nV/rtHz, chopper-stabilized instrumentation amplifier for chronic measurement of bio-potentials

Timothy Denison, Kelly Consoer, Wesley Santa, Greg Molnar, Keith Miesel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

This paper describes a micropower instrumentation amplifier that enables chronic biopotential sensing in battery powered applications. The amplifier is chopper-stabilized to eliminate excess noise from 1/f or popcorn processes, insuring the highest fidelity of signal measurement for diagnostic analysis. The circuit consumes 2.0 μW of power from a 1.8V supply, with a noise floor of 0.94μVrms in a bandwidth from 0.05 to 100Hz; the resulting noise-efficiency factor of 3.6 is the lowest published to date. The specific implementation of chopper stabilization also provides railto-rail inputs and 100dB CMRR at low frequency. A digitally programmable on-chip high pass filter (0.05Hz, 0.5Hz and 2.5Hz) is used to suppress front-end electrode offsets while maintaining relevant physiological data. Although the focus of this paper is on biopotential sensing, the circuit architecture is also useful for a variety of micropower sensor interfaces using synchronous demodulation.

Original languageEnglish (US)
Title of host publication2007 IEEE Instrumentation and Measurement Technology, IMTC 2007 - Conference Proceedings - Synergy of Science and Technology in Instrumentation and Measurement
StatePublished - Sep 28 2007
Event2007 IEEE Instrumentation and Measurement Technology, IMTC 2007 - Synergy of Science and Technology in Instrumentation and Measurement - Warsaw, Poland
Duration: May 1 2007May 3 2007

Publication series

NameConference Record - IEEE Instrumentation and Measurement Technology Conference
ISSN (Print)1091-5281

Other

Other2007 IEEE Instrumentation and Measurement Technology, IMTC 2007 - Synergy of Science and Technology in Instrumentation and Measurement
CountryPoland
CityWarsaw
Period5/1/075/3/07

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Keywords

  • Biosensing
  • Chopper stabilization
  • ECG
  • EEG
  • Instrumentation amplifier
  • Micropower
  • Synchronous detection

Cite this

Denison, T., Consoer, K., Santa, W., Molnar, G., & Miesel, K. (2007). A 2 μW, 95nV/rtHz, chopper-stabilized instrumentation amplifier for chronic measurement of bio-potentials. In 2007 IEEE Instrumentation and Measurement Technology, IMTC 2007 - Conference Proceedings - Synergy of Science and Technology in Instrumentation and Measurement [4258133] (Conference Record - IEEE Instrumentation and Measurement Technology Conference).