Abstract
The ECG signal reflects the physiological characteristics of the heart to a certain extent and is an extremely important clinical reference for the diagnosis, treatment, and prevention of cardiovascular diseases. However, the ECG signal is affected by various noises during the acquisition process, especially the 50Hz noise from power lines which makes the diagnosis and analysis of ECG difficult. In this paper, a transconductance amplifier with strong practical applications is proposed and designed to filter out interference from ECG signals in power lines, based on the characteristics of ECG signals and the ability of differential signals to effectively resist external common-mode noise. This amplifier is able to effectively filter out 50Hz interference from power lines and features a high common-mode rejection ratio and low power consumption, in addition to using relatively few components and low production costs.
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