A micropower electrocardiogram amplifier
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We introduce an electrocardiogram (EKG) preamplifier with a power consumption of 2.8 muW, 8.1 muV[subscript rms] input-referred noise, and a common-mode rejection ratio of 90 dB. Compared to previously reported work, this amplifier represents a significant reduction in power with little compromise in signal quality. The improvement in performance may be attributed to many optimizations throughout the design including the use of subthreshold transistor operation to improve noise efficiency, gain-setting capacitors versus resistors, half-rail operation wherever possible, optimal power allocations among amplifier blocks, and the sizing of devices to improve matching and reduce noise. We envision that the micropower amplifier can be used as part of a wireless EKG monitoring system powered by rectified radio-frequency energy or other forms of energy harvesting like body vibration and body heat.
Date issued
2009-09Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
IEEE Transactions on Biomedical Circuits and Systems
Publisher
Institute of Electrical and Electronics Engineers
Citation
Fay, L., V. Misra, and R. Sarpeshkar. “A Micropower Electrocardiogram Amplifier.” Biomedical Circuits and Systems, IEEE Transactions on 3.5 (2009): 312-320.© 2009 Institute of Electrical and Electronics Engineers.
Version: Final published version
Other identifiers
INSPEC Accession Number: 10890436
ISSN
1932-4545
Keywords
Common-mode feedback (CMFB), electrocardiograph (ECG), low noise, low power