Low Noise, High accuracy Analog Electrocardiogram (ECG) Signal Front End Amplifier for Wearable equipment

Abstract

Due to the semiconductor technology rapid growth, circuit device becomes smaller and has lower power consumption, making body care portable devices easily realized. Among these portable devices, electrocardiogram (ECG), blood pressure, and blood glucose are important parameters for health diagnosis. Therefore, in this work, based on the traditional 3-op-amp instrumentation amplifier, a front-end Electrocardiogram signal amplifier is designed. According to the characteristics in the bioelectric signal acquisition, a right-leg-driven (DRL) circuit is added to make the CMRR of the amplifier higher and improve the power-line-interference rejecting ability. The simulation result in LTspice indicates that the amplifier provides a gain about 36 dB with low noise about 6.08 $\mu$ V. Also, the other parameters of the amplifier meet the requirements of ECG signal monitor and are suitable for wearable equipment.