低成本高精度单导联心电信号采集电路设计

为解决心电信号采集过程易受噪声干扰、 电路复杂等问题, 设计了低成本高精度心电采集电路, 采用芯片 AD8232 采集并放大心电信号, 引入 100 Hz 低通滤波器、 0. 05 Hz 高通滤波器及 50 Hz 陷波电路。 实验表明,高频干扰衰减 60 dB(10 倍频), 50 Hz 噪声衰减了 41. 08 dB。 该电路有效地滤除了单导联心电信号中掺杂的共模干扰、 肌电干扰、 基线漂移和工频干扰等, 提高了单导联心电采集精度, 可应用于家用医疗监护、 便携式可穿戴式心电监测设备。

Single Lead ECG Signal Acquisition Circuit with Low Cost and High Precision

In order to solve the problems of noise interference and complex circuit in the process of ECG(Electrocardiograph) signal acquisition, a low cost high precision ECG acquisition circuit is designed. AD8232is used to collect and amplify ECG signals. By using 100 Hz low-pass filter, 0. 05 Hz high-pass filter and 50 Hznotch circuit, the interference attenuation of low frequency and high frequency is 60 dB(tenfold), and the noiseattenuation of 50 Hz is 41. 08 dB. It can effectively filter out the doped common mode interference,myoelectric interference, baseline drift, power frequency interference, etc. , and improve the acquisition accuracy of singlelead EGC. This circuit can be used in home medical monitoring and portable wearable ECG monitoring equipment.