An ultra low-power ECG amplifier for wearable devices using classical 2-stage OTA. Issue 1 (May 2021)

• Record Type: Journal Article
• Authors: Zheng, Keran; Sun, Yuchen; Zhang, Yuelin
• Is Part Of: Journal of physics. Volume 1907:Issue 1(2021)
• Publication Date: 2021-05
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1907/1/012008
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Wearabl smart devices have become an important method to monitor people's health. This research work aims to offer a relatively optimum solution to amplify the biomedical signal in the case of wearable devices. This is done by using the single-stage amplifier and Operational Transimpedance Amplifier (OTA) stage. The OTA stage uses a typical 2-stage amplifier topology, with first-stage differential pair, second stage a common source to provide high-gain. Simulation results showed that the amplifier has a differential gain of 40.04dB, a total integrated input-referred noise of 3.59uVrms, a total power consumption of 1.44uW, a NEF of 21 and a CMRR of 82 dB. In conclusion, the results verify the single-stage amplifier topology is useful and satisfy the low-power requirement.