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Related Experiment Videos

Low-frequency white noise generators for biomedical systems.

J R Singer, I Oviedo

    Journal of Clinical Engineering
    |March 13, 1978
    PubMed
    Summary
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    This study presents two electronic white noise sources for biological and medical research. Both transistor and digital signal sources offer flat frequency spectra from 1-100 Hz, suitable for most applications.

    Area of Science:

    • Electronics
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Electronic noise sources are crucial for calibrating and investigating biological and medical research equipment.
    • Existing noise sources may not meet the specific requirements for white noise with a flat frequency spectrum.
    • A flat frequency spectrum from 1 to 100 Hertz is desired for accurate signal analysis.

    Purpose of the Study:

    • To design and evaluate two novel electronic white noise sources.
    • To compare the spectral characteristics of the proposed noise sources.
    • To determine the suitability of these sources for biological and medical research applications.

    Main Methods:

    • Design and implementation of a noise source utilizing a reverse-biased transistor base-emitter junction in avalanche mode.

    Related Experiment Videos

  • Design and implementation of a noise source based on a pseudo-random digital signal from a MOS integrated circuit (IC).
  • Spectral analysis and comparison of the output signals from both designed sources.

    • Main Results:

    • Both designed electronic noise sources successfully generated white noise.
    • The frequency spectra for both sources were measured and presented, demonstrating a flat response from 1 to 100 Hertz.
    • The performance of the transistor-based source and the digital signal source were compared.

    Conclusions:

    • Two viable electronic white noise sources meeting the specified frequency spectrum requirements were developed.
    • The choice between the transistor-based source and the MOS IC pseudo-random digital signal source depends on specific application needs.
    • Both sources are deemed satisfactory for the majority of biological and medical research equipment investigations.