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Related Concept Videos

Instrumentation Amplifier01:25

Instrumentation Amplifier

947
An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
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Electrocardiogram01:29

Electrocardiogram

5.1K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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A 44µW Two-Electrode ECG Acquisition ASIC With Hybrid Motion Artifact Removal and Power-Efficient R-Peak Detection.

Tianxiang Qu, Xuecheng Yang, Biao Tang

    IEEE Transactions on Biomedical Circuits and Systems
    |March 28, 2025
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    Summary

    This study presents a low-power integrated circuit for wearable electrocardiogram (ECG) acquisition, effectively removing motion artifacts and interference for accurate heart rate detection in two-electrode systems.

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    Area of Science:

    • Biomedical Engineering
    • Integrated Circuit Design
    • Wearable Health Technology

    Background:

    • Wearable ECG systems face challenges with motion artifacts (MA), common-mode interference (CMI), and electrode-tissue impedance (ETI) variations, leading to heart rate detection errors.
    • These issues are particularly pronounced in simpler two-electrode ECG configurations, limiting their practical application.

    Purpose of the Study:

    • To develop an ambulatory ECG acquisition Application-Specific Integrated Circuit (ASIC) with integrated motion artifact removal (MAR) and heart rate detection capabilities.
    • To specifically address the limitations of two-electrode ECG systems for accurate and power-efficient heart rate monitoring.

    Main Methods:

    • An improved common-mode cancellation scheme was implemented to suppress CMI up to 40Vpp, compensating for the lack of a bias electrode.
    • A hybrid MAR technique was developed, incorporating electrode-tissue impedance (ETI) and DC electrode offset (DEO) signals into an adaptive filter to extract and suppress motion artifacts.
    • The ASIC was fabricated using a 180nm CMOS process, integrating a low-power instrumentation amplifier (IA) with specific performance metrics.

    Main Results:

    • The proposed common-mode cancellation effectively suppressed CMI, while the hybrid MAR technique prevented channel saturation and accurately removed motion artifacts in real-time.
    • The fabricated ASIC demonstrated excellent performance, including an input-referred noise (IRN) of 0.62μVrms, input impedance of 1.9GΩ, and a total common-mode rejection ratio (T-CMRR) of 92dB at 50Hz.
    • In a two-electrode setup, the ASIC produced high-quality ECG signals with clear QRS complexes, enabling accurate R-peak detection and real-time heart rate calculation.

    Conclusions:

    • The developed ambulatory ECG ASIC offers a robust solution for accurate and power-efficient heart rate detection in two-electrode wearable systems.
    • The integrated MAR and CMI suppression techniques significantly improve ECG signal quality, even under challenging motion conditions.
    • This work enables more reliable and accessible continuous heart rate monitoring through wearable devices.