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Related Experiment Videos

Composite instrumentation amplifier for biopotentials.

R Pallás-Areny1, J G Webster

  • 1Departamento de Ingenieria Electrónica, U.P.C., Barcelona, Spain.

Annals of Biomedical Engineering
|January 1, 1990
PubMed
Summary
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This study introduces a novel biopotential amplifier design that enhances common-mode rejection ratio (CMRR) using a potentiometer. This design achieves superior performance compared to standard operational amplifiers, making it ideal for precise biopotential measurements.

Area of Science:

  • Biomedical Engineering
  • Electronic Instrumentation

Background:

  • Biopotential amplifiers require high Common-Mode Rejection Ratio (CMRR) to accurately measure biological signals amidst noise.
  • Existing designs often rely on precision components or complex configurations to achieve adequate CMRR.

Purpose of the Study:

  • To present a novel instrumentation biopotential amplifier design.
  • To improve CMRR using a potentiometer without precision resistors or high-CMRR operational amplifiers (op amps).
  • To provide methods for calculating CMRR in differential-input stages.

Main Methods:

  • Designed an AC-coupled buffer with high input impedance and integrated it with a differential amplifier.
  • Utilized a potentiometer to adjust resistor ratios for improved CMRR.
  • Calculated CMRR for differential-input stages with both differential and single-ended outputs.

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Main Results:

  • Achieved CMRR exceeding 126 dB at 10 Hz and 106 dB at 100 Hz with a 741 op amp, significantly higher than the op amp alone (90 dB).
  • Demonstrated a CMRR of 126 dB at 10 and 100 Hz using an LF355 op amp.
  • Showed that passive component mismatch in the input buffer reduced CMRR to 112 dB at 60 Hz, which is acceptable for typical power-line interference.

Conclusions:

  • The proposed potentiometer-based design effectively enhances CMRR in biopotential amplifiers.
  • This approach offers a cost-effective and simpler method for achieving high CMRR compared to traditional techniques.
  • The design is suitable for applications requiring precise biopotential signal acquisition, even in noisy environments.