A 672-nW, 670-n Vrms ECG Acquisition AFE With Noise-Tolerant Heartbeat Detector

This paper presents an electrocardiogram acquisition analog front-end (AFE) with a noise tolerant heartbeat (HB) detector. Source degradation and transconductance bootstrap techniques are incorporated into the AFE to reduce the 1/f noise of the amplifier. Furthermore, the chopper modulation, DC-serv...

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Bibliographic Details
Published inIEEE open journal of circuits and systems Vol. 4; pp. 25 - 35
Main Authors Zeng, Yanhan, Li, Zhixian, Chen, Weijian, Zhou, Wei, Bao, Yuchen, Chen, Yongsen, Li, Yongfu
Format Journal Article
LanguageEnglish
Published New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2023
Subjects
Circuits
Electrocardiography
Interference
Noise levels
Power consumption
Sensors
Transconductance
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Summary:This paper presents an electrocardiogram acquisition analog front-end (AFE) with a noise tolerant heartbeat (HB) detector. Source degradation and transconductance bootstrap techniques are incorporated into the AFE to reduce the 1/f noise of the amplifier. Furthermore, the chopper modulation, DC-servo loop (DSL) and pre-charge technology are combined to reduce interference from the environment. A mixed-signal implementation of HB detector with the symmetric-comparison loop is proposed to reduce the power consumption and area, which also suppresses motion artifact interference by adaptive thresholds. Implemented in [Formula Omitted] CMOS process, the circuit only occupies an area of [Formula Omitted] and consumes [Formula Omitted] at a 1.2-V supply, of which AFE and HB detector consume 507 nW and 110 nW, respectively. Simulation results show that the gain and the CMRR of AFE range from 30–45 dB and 65–105 dB, respectively. The input-referred noise is 670 nVrms with a mid-band gain of 42 dB and a bandwidth ranging from 0.5 Hz to 1 kHz.
ISSN:2644-1225
2644-1225
DOI:10.1109/OJCAS.2023.3237839