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Related Experiment Videos

AC-coupled front-end for biopotential measurements.

Enrique Mario Spinelli1, Ramon Pallàs-Areny, Miguel Angel Mayosky

  • 1Laboratorio de Electrónica Industrial, Control e Instrumentación, Departamento de Electrotecnia, Universidad Nacional de La Plata, La Plata, Argentina. spinelli@ing.unlp.edu.ar

IEEE Transactions on Bio-Medical Engineering
|April 3, 2003
PubMed
Summary

This study introduces a novel AC coupling network for biopotential measurements, improving common-mode rejection ratio (CMRR) and enabling high-gain amplifiers. The design enhances signal quality in electrocardiogram (ECG) amplifiers.

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Area of Science:

  • Biomedical Engineering
  • Electronics Engineering
  • Signal Processing

Background:

  • AC coupling is crucial for biopotential measurements to handle large electrode offset potentials.
  • Traditional AC coupling methods using grounded resistors degrade the common-mode rejection ratio (CMRR).
  • High-gain amplifiers require effective AC coupling to prevent saturation from large DC offsets.

Purpose of the Study:

  • To propose a novel balanced input AC-coupling network for biopotential amplifiers.
  • To achieve high CMRR without compromising the bias path or differential DC input voltage.
  • To enable high-gain, low-power biopotential amplifiers compatible with common-mode DC shifting strategies.

Main Methods:

  • Development of a passive, balanced input AC-coupling network.

Related Experiment Videos

  • Integration of a bias path without grounding, preserving CMRR.
  • Implementation of a driven-right-leg circuit for closed-loop common-mode voltage control.

    • Main Results:

    • The proposed network provides a high CMRR without grounding, maintaining differential DC input voltage.
    • Differential signals are AC coupled, while common-mode voltages are DC coupled.
    • An electrocardiogram (ECG) amplifier demonstrated a CMRR of 123 dB at 50 Hz.

    Conclusions:

    • The novel AC-coupling network facilitates high-gain biopotential amplifiers with reduced component count and power consumption.
    • This design improves signal integrity in biopotential measurements, particularly for ECG applications.
    • The circuit's compatibility with DC common-mode shifting strategies enhances its utility in single-supply amplifiers.