Group-Chopping: An 8-Channel, 0.04% Gain Mismatch, 2.1 µW 0.017 mm2 Instrumentation Amplifier for Bio-Potential Recording

Group-Chopping: An 8-Channel, 0.04% Gain Mismatch, 2.1 µW 0.017 mm2 Instrumentation Amplifier for Bio-Potential Recording

An 8-channel AFE with a group-chopping instrumentation amplifier (GCIA) is proposed for bio-potential recording applications. The group-chopping technique cascades chopper switches to progressively swap channels and dynamically removes gain mismatch among all channels. An 8-phase non-overlapping clo...

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Veröffentlicht in:IEEE transactions on biomedical circuits and systems 2022-06, Vol.16 (3), p.361-371
Hauptverfasser: Tang, Tao, Park, Jeong Hoan, Zhang, Lian, Ng, Kian Ann, Yoo, Jerald
Format: Artikel
Sprache:eng
Schlagworte:
Amplification
Amplifiers
Analog Front-End (AFE)
between-channel CMRR (CMRR<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _{\text{btw-chn}}</tex-math> </inline-formula> </named-content>)
bio-recording AFE
Biomedical monitoring
Channels
chopper-stabilizat- ion
Cutting
Electrocardiography
Electrodes
Electroencephalography
Gain
gain mismatch
group-chopping
Instrumentation
instrumentation amplifier
Instruments
multi-channel gain mismatch mitigation
Recording
Switches
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Zusammenfassung:An 8-channel AFE with a group-chopping instrumentation amplifier (GCIA) is proposed for bio-potential recording applications. The group-chopping technique cascades chopper switches to progressively swap channels and dynamically removes gain mismatch among all channels. An 8-phase non-overlapping clocking scheme is developed and achieves excellent between-channel gain mismatch characteristics. The dynamic offsets among all channels are mitigated by the GCIA as well. The GCIA is the first work that minimizes the gain mismatch across more than two channels. With the help of the group-chopping, combined with an area-efficient open-loop structure, the GCIA shows
ISSN:1932-4545
1940-9990
DOI:10.1109/TBCAS.2022.3166513