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Low Noise, High Input Impedance Digital-Analog Hybrid Offset Suppression Amplifier for Wearable Dry Electrode ECG Monitoring

Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China
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Electronics 2020, 9(1), 165; https://doi.org/10.3390/electronics9010165
Received: 7 November 2019 / Revised: 6 December 2019 / Accepted: 13 January 2020 / Published: 16 January 2020
(This article belongs to the Section Bioelectronics)
The portable real-time electrocardiogram (ECG) is a convenient and promising electronic device for cardiovascular diseases patients. However, unlike wet gel electrodes in traditional clinical applications, dry electrodes are competent for comfortable long-time wearing and can prevent skin ulceration. Its ultra-high source impedance and electrode offset (EOS) make traditional chopper amplifiers with low input impedance and limited EOS range difficult to apply to this area. To overcome these challenges, this paper proposes a novel chopper amplifier topology. This architecture includes a gain control loop, a ripple reduction loop, and a DC-servo loop (DSL). The proposed sampling input stage and digital-analog hybrid DSL are employed to boost input impedance and extend the EOS handing range. Designed with a 0.18 µm 1P6M 1.8 V CMOS salicide process, the proposed chopper capacitively coupled instrumentation amplifier achieves an ultra-high input impedance of 120 GΩ (<0.05 Hz) or 2.1 GΩ (0.6~250 Hz), an EOS handing range of ±325 mV and a low noise of 1.9 μVrms at 0.6~250 Hz. It occupies an area of 0.36 mm2 and only consumes a quiescent current of 11 μA. View Full-Text
Keywords: (electrocardiogram) ECG; sampling input stage; chopper amplifier; ultra-high input impedance; (electrode offset) EOS (electrocardiogram) ECG; sampling input stage; chopper amplifier; ultra-high input impedance; (electrode offset) EOS
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Xu, W.; Wang, T.; Wei, X.; Yue, H.; Wei, B.; Duan, J.; Li, H. Low Noise, High Input Impedance Digital-Analog Hybrid Offset Suppression Amplifier for Wearable Dry Electrode ECG Monitoring. Electronics 2020, 9, 165.

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