Key result
A balanced operational transconductance amplifier successfully removed 50Hz power line noise from ECG signals, achieving a differential mode gain of 40V and common mode gain of -107V up to 5kHz.
Why the study?
Amplifying and filtering the ECG signal is critical, but simple balanced OTA filters designed for hospital cost performance cannot guarantee long stable use when implemented across different ECG machine models.
Answers are grounded in this paper and cite their sources.
A balanced OTA filter design effectively removes 50Hz power line noise from ECG signals in simulation, though further improvements in power efficiency and stability are needed for industrial application.
Electrocardiograph (ECG) is a technology that uses an electrocardiograph to record the electrical activity change pattern generated by each cardiac cycle of the heart from the body surface. It is a simple test that can be used to check heart's rhythm and electrical activity of human. The amplifying and filtering of the ECG signal is the most important part of ECG signal procedures and this paper shows a balanced OTA that can fully remove the 50hz noise from the power line. Due to cost performance for the real situation in the hospital and industrial cost, the balanced OTA filter in this paper is simple and cannot guarantee a long stable use when it is implemented on an ECG machine with other models. This paper will show two different ways to increase gain and power efficiency which are using fully differential OTA and using higher bandwidth.
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Yunfu Ao (2023) studied ECG signal noise. Balanced operational transconductance amplifier (OTA) vs. Unbalanced structure was evaluated on 50Hz noise removal and signal gain. A balanced operational transconductance amplifier successfully removed 50Hz power line noise from ECG signals, achieving a differential mode gain of 40V and common mode gain of -107V up to 5kHz.
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