Analog Front-End Design and Construction for ECG Monitoring System

Cardiac health monitoring has become very important due to the increasing risk of heart diseases. According to W.H.O (World Health Organization), heart disease is the highest killer in the world. ECG is the important investigation test widely used to find any abnormality in the heart’s condition. Analog front-end is the important component of an ECG monitoring system. This paper aims to present the proposed Analog Front-End (AFE) Circuit design to be used in an ECG monitoring system. Instrumentation amplifier INA128 is used for amplification of signals acquired through electrodes followed by high-pass and low-pass filters designed for the removal of artifacts from the signals. The AFE is tested on DSO (digital storage oscilloscope) and confirms the standard ECG trace. The quality of the amplified signal is effectively improved by the high-pass and low-pass filters as it can be seen from the trace with no baseline defect and very few high-frequency noises are present at the result. The constructed AFE circuit will be used in an ECG monitoring system for the digital processing of ECG signals for monitoring and diagnosis.