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Related Experiment Videos

A novel fully differential biopotential amplifier with dc suppression.

Enrique Mario Spinelli1, Nolberto Martínez, Miguel Angel Mayosky

  • 1Laboratorio de Electrónica Industrial Control e Instrumentación, Facultad de Ingeniería, Universidad Nacional de La Plata and Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina. spinelli@ieee.org

IEEE Transactions on Bio-Medical Engineering
|August 18, 2004
PubMed
Summary

This study introduces a novel fully differential biopotential amplifier with a unique DC-suppression circuit. It achieves high common mode rejection ratio (CMRR) and fast recovery without matched components, ideal for low-voltage systems.

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Area of Science:

  • Biomedical Engineering
  • Analog Circuit Design

Background:

  • Fully differential amplifiers offer high gain and common mode rejection ratio (CMRR) but are limited in biopotential measurements by electrode offset voltage.
  • Conventional solutions for DC offset in biopotential amplifiers often compromise CMRR and increase input noise.
  • Existing methods typically convert differential signals to single-ended, limiting performance.

Purpose of the Study:

  • To present a novel fully differential biopotential amplifier.
  • To introduce a fully differential DC-suppression circuit that avoids matched passive components.
  • To enhance CMRR and enable fast recovery from DC transients in low-voltage systems.

Main Methods:

  • Development of a fully differential DC-suppression circuit.
  • Integration of the circuit into a fully differential biopotential amplifier architecture.

Related Experiment Videos

  • Implementation using standard low-power operational amplifiers (op amps) and a 5-V power supply.

    • Main Results:

    • The amplifier accepts input offset voltages up to +/-500 mV.
    • Achieved a high CMRR of 102 dB at 50 Hz.
    • Demonstrated fast recovery from DC level transients and overload conditions, adhering to the AAMI EC38 standard.

    Conclusions:

    • The proposed fully differential amplifier with integrated DC suppression offers superior performance without requiring matched passive components.
    • This design is particularly suitable for low supply voltage applications in biopotential measurements.
    • The amplifier meets stringent standards for offset voltage handling and transient recovery.