공통-모드 간섭 (CMI)에 강인한 2-전극 기반 심전도 계측 회로
CMI Tolerant Readout IC for Two-Electrode ECG Recording
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초록
This study introduces an efficient readout circuit designed for two-electrode electrocardiogram (ECG) recording, characterizedby its low-noise and low-power consumption attributes. Unlike its three-electrode counterpart, the two-electrodeECG is susceptible to common-mode interference (CMI), causing signal distortion. To counter this, the proposed circuit integratesa 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 CMIsurpasses the predetermined range set by the window comparator. This ensures power efficiency and minimizes intermodulationdistortion (IMD) arising from switching noise. To maintain ECG signal accuracy, the circuit employs a chopperstabilizedinstrumentation amplifier (IA) for low-noise attributes, and to achieve high input impedance, it incorporates afloating high-pass filter (HPF) and a current-feedback instrumentation amplifier (CFIA). This comprehensive design integratesvarious components, including a QRS peak detector and serial peripheral interface (SPI), into a single 0.18-μm CMOSchip occupying 0.54mm2 . Experimental evaluations showed a 0.59 μVRMS noise level within a 1–100 Hz bandwidth anda power draw of 23.83 μW at 1.8 V.
Abstract
This study introduces an efficient readout circuit designed for two-electrode electrocardiogram (ECG) recording, characterizedby its low-noise and low-power consumption attributes. Unlike its three-electrode counterpart, the two-electrodeECG is susceptible to common-mode interference (CMI), causing signal distortion. To counter this, the proposed circuit integratesa 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 CMIsurpasses the predetermined range set by the window comparator. This ensures power efficiency and minimizes intermodulationdistortion (IMD) arising from switching noise. To maintain ECG signal accuracy, the circuit employs a chopperstabilizedinstrumentation amplifier (IA) for low-noise attributes, and to achieve high input impedance, it incorporates afloating high-pass filter (HPF) and a current-feedback instrumentation amplifier (CFIA). This comprehensive design integratesvarious components, including a QRS peak detector and serial peripheral interface (SPI), into a single 0.18-μm CMOSchip occupying 0.54mm2 . Experimental evaluations showed a 0.59 μVRMS noise level within a 1–100 Hz bandwidth anda power draw of 23.83 μW at 1.8 V.
참고문헌 (16)
- D. De Bacquer, "Prognostic value of ECG findings for total, cardiovascular disease, and coronary heart disease death in men and women", Heart, 80(6), pp.570~577 (1998)
- A. Bansal, "Portable out-of-hospital electrocardiography : A review of current technologies", Journal of arrhythmia, 34(2), pp.129~138 (2018)
- B. B. Winter, "Driven-right-leg circuit design", IEEE Trans. Biomed. Eng., BME-30(1), pp.62~66 (1983)
- A. Wong, "An ECG measurement IC using driven-right-leg circuit", proc. of 2006 IEEE Int. Symp. Circuits. Syst. (ISCAS), pp.345~348 (2016)
- N. Koo, "A 24.8-μW biopotential amplifier tolerant to 15-VPP Common-mode interference for two-electrode ECG recording in 180-nm CMOS", IEEE J. SolidState Circuits, 56(2), pp.591~600 (2020)
- N. Koo, "22.4 A 27.8μW Biopotential Amplifier Tolerant to 30Vpp Common-Mode Interference for Two-Electrode ECG Recording in 0.18μm CMOS", Proc. of 2019 IEEE Int. Solid- State Circuits Conf. - (ISSCC), pp.366~368 (2019)
- H. Kim, "Chopper-Stabilized LowNoise Multipath Operational Amplifier with Dual Ripple Rejection Loops", IEEE Trans. Circuits. Syst. II: Express Briefs, 67(11), pp.2427~2431 (2020)
- Q. Fan, "A 1. 8μW 1μV-offset capacitively-coupled chopper instrumentation amplifier in 65nm CMOS", Proc. of 2010 Proc. ESSCIRC, pp.170~173 (2010)
- Q. Fan, "Capacitively-coupled Chopper Instrumentation Amplifiers : An Overview", Proc. of 2018IEEE SENSORS, pp.1~4 (2018)
- K. Nam, "A Four-Channel Low-noise readout IC for air flow measurement using hot wire anemometer in 0.18 μm CMOS technology", Sensors, 21(14), pp.4694(1)~4694(16) (2021)
- R. Wu, "The design of a chopped current-feedback instrumentation amplifier", Proc. of 2008 IEEE Int. Symp. Circuits. Syst. (ISCAS), pp.2466~2469 (2008)
- R. Wu, "A chopper current-feedback instrumentation amplifier with a 1 mHz 1", f noise corner and an AC-coupled ripple reduction loop, 2009, pp.44(12), 3232~3243
- H. Kim, "A configurable and low-power mixed signal SoC for portable ECG monitoring applications", IEEE trans. Biomed. Circuits. Syst, 8(2), pp.257~267 (2013)
- Y. M. Chi, "Dry-Contact and Noncontact Biopotential Electrodes: Methodological Review", IEEE Rev. Biomed. Eng, 3, pp.106~119 (2010)
- M. Chen, "A 400GΩ Input-Impedance, 220MVpp Linear-Input-Range, 2.8Vpp CM-InterferenceTolerant Active Electrode for Non-Contact Capacitively Coupled ECG Acquisition", Proc. of 2018 IEEE Symp. VLSI Circuits, pp.129~130 (2018)
- X. Zhou, "A wearable ear-EEG recording system based on dry-contact active electrodes", Proc. of 2016 IEEE Symp. VLSI Circuits(VLSI-Circuits), pp.1~2 (2016)