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便携式心电仪信号采集电路的设计研究

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便携式心电仪具有功耗低、稳定性高、使用方便等优点,使用越来越广泛。便携式心电仪中信号采集电路系统由探测电极、前置放大电路、带通滤波电路、50Hz馅波电路、主放大电路以及电平抬升电路等部分组成,其输出信号经模数转换后可进行显示和处理。为提高心电仪的工作稳定性、降低功耗,选用了低功耗、低电压的仪表放大器AD620,为消除50Hz工频干扰,采用了专门设计的50Hz馅波电路,确保心电信号的有效传输。采用Multisim软件对各部分电路进行了仿真,确保设计电路能达到预期目的。

Portable ECG device used more and more widely with its low power consumption, high stability, easy to use. A portable ECG signal acquisition circuit system include detecting electrodes, preamplifier circuit, band-pass filter circuit, 50 Hz filling wave circuit, main amplifier and voltage lifting circuit. After the output analog signal conversion to digital signal can display and process by MPU. We choose the low power consumption, low voltage amplifier AD620 for improving the stability, reducing the power consumption of ECG, in order to eliminate 50 Hz interference, we using the 50 Hz filling wave circuit that is specially designed to ensure the effective transmission of ECG signal. Multisim software is u...