A Micropower Chopper CBIA Using DSL-Embedded Input Stage with 0.4 v EO Tolerance for Dry-Electrode Biopotential Recording

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dc.contributor.authorThanapitak, Surachoke
dc.contributor.authorSurakampontorn, Wanlop
dc.contributor.authorSawigun, Chutham
dc.date.accessioned2026-08-06T10:41:42Z
dc.date.available2026-08-06T10:41:42Z
dc.date.issued2023-06-01
dc.description.abstractA chopper instrumentation amplifier (IA) dedicated for bio-potential acquisition usually requires a linearized input stage for large electrode offset voltage accommodation. This linearization leads to excessive power consumption when sufficiently low input-referred noise (IRN) is required. We present a current-balance IA (CBIA) without the need for the input stage linearization. It uses two transistors to operate as an input transconductance stage and a dc-servo loop (DSL) at the same time. An off-chip capacitor completes the DSL by ac coupling the source terminals of the input transistors via chopping switches realizing a sub-Hz high-pass cutoff frequency for dc rejection. Fabricated in a 0.35-μm CMOS process, the proposed CBIA occupies 0.41 mm2 and consumes 1.19 μW from a 3 V dc supply. Measurements show that the IA achieves an input-referred noise of 0.91 μVrms over 100 Hz bandwidth. This corresponds to a noise efficiency factor of 2.22. Typical CMRR of 102.1 dB is achieved for zero offset and degraded to 85.9 dB when a ±0.3 V input offset was applied. Gain variation of 0.5% is maintained within the range of ±0.4 V input offset. The resulting performance meets well with the requirement for ECG and EEG recording using dry electrodes. A demonstration for the use of the proposed IA on a human subject is also provided.
dc.identifier.citationIEEE Transactions on Biomedical Circuits and Systems, 17(3), 458-469, 2023
dc.identifier.doi10.1109/TBCAS.2023.3265273
dc.identifier.issn19324545
dc.identifier.other2-s2.0-85153343011
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/14473
dc.sourceIEEE Transactions on Biomedical Circuits and Systems
dc.subjectBiopotential
dc.subjectDC-servo loop
dc.subjectECG/EEG
dc.subjectelectrode offset
dc.subjectinstrumentation amplifier
dc.subjectlow-noise
dc.subjectmicropower
dc.titleA Micropower Chopper CBIA Using DSL-Embedded Input Stage with 0.4 v EO Tolerance for Dry-Electrode Biopotential Recording
dc.typeArticle

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