Abstract: 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.

Key words: electrocardiograph(EGC) signal, single lead, filter circuit, AD8232 chip