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首页> 外文会议>National Conference on Biomedical Engineering;International Iranian Conference on Biomedical Engineering >A Low-Power Current-Mode Analog QRS-Detection Circuit for Wearable ECG Sensors
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A Low-Power Current-Mode Analog QRS-Detection Circuit for Wearable ECG Sensors

机译：用于可穿戴式ECG传感器的低功耗电流模式模拟QRS检测电路

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摘要

In this paper an ultra-low power current-mode analog circuit is proposed for detecting QRS complexes from the ECG signal. An accurate low-power operation is obtained by using a non-linear energy operator and designing all the transistors in subthreshold region. For improving the performance of the circuit, three filters with very-low cutoff frequencies are utilized which do not require large capacitors and so do not occupy large area. Two of the three filters are used for realizing onset detection method and the other is used for estimating a threshold which is required for QRS detection. Simulating over the entire MIT/BIH arrhythmia database shows the acceptable values of 98.69% for the average accuracy, 99.24% for the sensitivity and 99.38% for the positive prediction. The proposed circuit is implemented in 0.18 μm CMOS technology with a 1.8 V supply voltage. Using the proposed circuit, no analog-to-digital converter is required to be used which save a considerable portion of the power and the area. Consuming a 71 nW power, the proposed circuit is suitable for wearable and implantable ECG monitoring applications.
机译：本文提出了一种超低功耗电流模式模拟电路，用于从ECG信号中检测QRS复合波。通过使用非线性能量算子并设计亚阈值区域内的所有晶体管，可以获得准确的低功率操作。为了改善电路的性能，使用了三个具有非常低的截止频率的滤波器，它们不需要大的电容器，因此不占用大的面积。三个滤波器中的两个用于实现起始检测方法，另一个用于估计QRS检测所需的阈值。在整个MIT / BIH心律失常数据库中进行仿真显示，平均准确性的可接受值为98.69％，敏感性为99.24％，阳性预测为99.38％。拟议的电路采用0.18μmCMOS技术实现，电源电压为1.8V。使用所提出的电路，不需要使用模数转换器，从而节省了大量的功率和面积。所建议的电路消耗71 nW的功率，适用于可穿戴和可植入ECG监测应用。

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