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Biomedical Technology Department
College of Applied Medical Sciences
Salman Bin Abdul-Aziz University
NASSER AL-SOLIMAN
HASSAN AL-TAMIMI
AMER AL-KTHERE
Design of Electrocardiogram
(ECG) System
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AbstractAbstract
• This research deals with the design of electrocardiogram (ECG) system that measures heart signals. The design is based on discrete electronics components that reduce the cost of the system. The system consists of 3-op-amp instrumentation amplifier, band-pass filter with bandwidth of 0.05Hz - 100Hz, mains frequency notch filter and a total gain of 1000. A stand alone split power supply is designed to power the system. The ECG system is tested using medical ECG electrodes and typical ECG signals were recorded from some volunteers.
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Research ObjectivesResearch Objectives
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Research ProblemResearch Problem
•Design and testing of ECG system using discrete components.
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Introduction to ECGIntroduction to ECG
The electrical activity associated with heart muscles travels through various tissues and reaches the surface of the body where it can be detected by electrodes applied to the skin. The record obtained from the depolarization and repolarization voltages of the heart muscle is called an electrocardiogram or ECG [1], [2].
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ECG System SpecificationsECG System Specifications
• - Three Op-amp Instrumentation amplifier (IA) and an inverting amplifier with total gain of 1000.
• - Band Width 0.05 – 100 Hz (Low Pass Filter (LPF) and High pass Filter (HPF)).
• - Notch Filter centered at 60Hz.
• - CMRR =80 dB
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The project block diagramThe project block diagram
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ECG designed Power supplyECG designed Power supply
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Split Power Supply DesignSplit Power Supply Design
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Instrumentation Amplifier Circuit Instrumentation Amplifier Circuit Diagram Diagram
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Band Pass Filter circuit diagramBand Pass Filter circuit diagram
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A Notch Filter centered at 60 Hz.A Notch Filter centered at 60 Hz.
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Constructed ECG circuit Constructed ECG circuit
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ECG System setup and testingECG System setup and testing
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Research Research OutputsOutputs
1. An operating ECG system is designed and tested.
2. ECG signals were recorded and displayed.
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ECG Signal Results Before the Notch ECG Signal Results Before the Notch Filter.Filter.
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ECG Signal Result After the Notch ECG Signal Result After the Notch FilterFilter
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CONCLUSIONS CONCLUSIONS
• The constructed single-channel ECG amplifier is capable of acquiring a satisfactory reading of rest ECG signal. It can be expanded to be a multi-channel ECG system capable of recording the standard 12-Lead system.
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• References
• [1] Bronzino, J.D., The Biomedical Engineering Handbook. CRC Press, Inc., 1995.
• [2] Carr, J.J. and J.M. Brown, Introduction to Biomedical Equipment Technology. Prentice Hall, Inc., 3rd ed., 1998.
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