센서학회지 (Journal of Sensor Science and Technology)

  • 제32권6호
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  • Pages.432-440
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  • 2023
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  • 1225-5475(pISSN)
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  • 2093-7563(eISSN)
한국센서학회 (The Korean Sensors Society)
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공통-모드 간섭 (CMI)에 강인한 2-전극 기반 심전도 계측 회로

CMI Tolerant Readout IC for Two-Electrode ECG Recording

  • 강상균 (충남대학교 전자공학과) ;
  • 남경식 (충남대학교 전자공학과) ;
  • 고형호 (충남대학교 전자공학과)
  • Sanggyun Kang (Department of Electronics Engineering, Chungnam National University) ;
  • Kyeongsik Nam (Department of Electronics Engineering, Chungnam National University) ;
  • Hyoungho Ko (Department of Electronics Engineering, Chungnam National University)
  • 투고 : 2023.09.22
  • 심사 : 2023.10.31
  • 발행 : 2023.11.30
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초록

This study introduces an efficient readout circuit designed for two-electrode electrocardiogram (ECG) recording, characterized by its low-noise and low-power consumption attributes. Unlike its three-electrode counterpart, the two-electrode ECG is susceptible to common-mode interference (CMI), causing signal distortion. To counter this, the proposed circuit integrates a common-mode charge pump (CMCP) with a window comparator, allowing for a CMI tolerance of up to 20 VPP. The CMCP design prevents the activation of electrostatic discharge (ESD) diodes and becomes operational only when CMI surpasses the predetermined range set by the window comparator. This ensures power efficiency and minimizes intermodulation distortion (IMD) arising from switching noise. To maintain ECG signal accuracy, the circuit employs a chopper-stabilized instrumentation amplifier (IA) for low-noise attributes, and to achieve high input impedance, it incorporates a floating high-pass filter (HPF) and a current-feedback instrumentation amplifier (CFIA). This comprehensive design integrates various components, including a QRS peak detector and serial peripheral interface (SPI), into a single 0.18-㎛ CMOS chip occupying 0.54 mm2. Experimental evaluations showed a 0.59 µVRMS noise level within a 1-100 Hz bandwidth and a power draw of 23.83 µW at 1.8 V.

키워드

과제정보

이 연구는 충남대학교 학술연구비에 의해 지원되었음.

참고문헌

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