PC-Based Patient Monitoring System : Development Of ECG Amplification Circuit

Khairul Nizam , Othman (2005) PC-Based Patient Monitoring System : Development Of ECG Amplification Circuit. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The Electrocardiograph (ECG) is a recording or display of the time-variant voltages generated by the electrical activity of the heart: This ECG waveform is analyzed by the cardiologist in diagnosis various diseases and conditions associated with the heart. This project concern with the recording and displaying of ECG waveform in real-time approach. The particular ECG bio-electric amplifier is designed and developed to interface with PC through parallel port. The scope of this project is focusing on the hardware part only. Three electrodes are connected to the human body, one with right arm, one with left arm and the other with right leg as a reference or ground to extract ECG signal from human body. The electrical signal appeared at the input of the ECG amplifier is typically less than 1 m V and it is essential to amplify the signal amplitude at least 1 00 times for further processing and to have· significant voltages for use with the display device (oscilloscope or monitor). The problem of amplification the signal is that there is a lot of noise interference which appear at input from ac power lines, ambient signal and etc. The output signal from ECG amplifier will interface with PC via 8 bit analog ADC then display on the PC.

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