Analog front-end measuring biopotential signal with effective offset rejection loop

This paper presents an analog front-end (AFE) IC design for recording biopotential signals. The AFE employs a capacitively coupled instrumentation amplifier to achieve a low-noise and high-common mode rejection ratio (CMRR) system. A ripple reduction loop is proposed to reduce the ripple generated b...

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Published inBio-medical materials and engineering Vol. 26 Suppl 1; no. s1; pp. S935 - S941
Main Authors Lim, Seunghyun, Kim, Hyunho, Song, Haryong, Cho, Dong-il Dan, Ko, Hyoungho
Format Journal Article
LanguageEnglish
Published Netherlands 01.01.2015
Subjects
Algorithms
Amplifiers, Electronic
Electrocardiography - instrumentation
Electrocardiography - methods
Electrophysiological Phenomena
Equipment Design
Humans
DC servo loop
Biopotential analog front-end (AFE)
electrocardiogram (ECG)
ripple reduction loop
electroencephalograph (EEG)
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Summary:This paper presents an analog front-end (AFE) IC design for recording biopotential signals. The AFE employs a capacitively coupled instrumentation amplifier to achieve a low-noise and high-common mode rejection ratio (CMRR) system. A ripple reduction loop is proposed to reduce the ripple generated by the up-modulating chopper. The low frequency noise is attenuated by an input AC coupling capacitor, and is attenuated again by a DC servo loop. The proposed AFE features a differential gain of 71 dB, and a CMRR of 89 dB, at 50 Hz. Furthermore, the proposed AFE can robustly acquire biopotential signals even in the presence of an input offset and ripples.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0959-2989
1878-3619
DOI:10.3233/BME-151387