Design And Implementation Of ECG Signal Detection Circuit With Self Calibration Function

In recent years,with the improvement of people's material living standards and the deterioration of the environment in the national economic development,cardiovascular disease has gradually become a major factor that endangers people's lives.The monitoring and prevention of cardiovascular diseases has gradually become a hot spot for human disease prevention and control.Because the ECG signal can be obtained by detecting the human body surface potential and the ECG is rich in cardiovascular disease information,it has important reference value for detecting various cardiovascular disorders such as arrhythmia,ventricular atrial hypertrophy,myocardial infarction,and myocardial ischemia.Therefore,the accurate and efficient collection and processing of ECG signals has important research significance for the monitoring of cardiovascular diseases.However,the existing ECG monitoring devices have various deficiencies,such as: excessive volume,high cost,inconvenience to carry,and being easily interfered with by an external environment.Therefore,designing a portable anti-jamming ECG signal processing circuit has practical significance for the screening and diagnosis of cardiac diseases and the construction of a three-dimensional community cardiovascular monitoring network.This article mainly designed the body finger ECG collection clips and electrodes,the use of dry rigid contact electrodes using the finger end to collect ECG signals more convenient;based on the domestic M2 chip ECG simulation Gathering circuit board,including the AD620 as the core The ECG Preamplifier module and the SGM8544 as the core chip filter module,this part of the ECG signal acquisition,filtering and de-noising processing;ECG signal self-calibration circuit to 8 selection 1 bidirectional analog switch MC14051 and M2 As the core chip,the ECG signals that are subject to external interference are targeted for compensation amplification and elevation,thereby realizing the protection of the ECG signal on the hardware circuit;the AD124S021 is a multi-channel signal analog-to-digital conversion circuit for the core chip.Digital signals such as human electrocardiogram and battery voltage are collected to facilitate the further processing of the signal.At the same time,two channels are reserved for the subsequent product iterations,such as adding motion detection,temperature monitoring,etc.;the cores are CC2540 and M2.Signal bluetooth transmission circuit,carry on the bluetooth transmission to the intelligent mobile terminal or cloud to the collected signal,convenient Step user tracking and the ECG data storage;simultaneously,as well as additional circuitry and power charging a battery protection circuit for a portable monitoring circuit implementation time,and a better user experience.By normalizing and comparing the collected ECG signal with the MIT_BIO signal,the ECG signal collected by the acquisition circuit contains relatively comprehensive physiological and health information.The waveforms of each band of the ECG are collected completely and can be sampled with the environment and collected.The change automatically switches the magnification and the lifting amplitude to obtain a more ideal waveform,which is more conducive to the medical analysis of the next ECG signal.