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Log-converting processor element for CCD linear imaging arrays.

S H Chang1, J T Boyd

  • 1University of Cincinnati, Department of Electrical & Computer Engineering, Solid State Electronics Laboratory, Cincinnati, Ohio 45221, USA.

Applied Optics
|November 15, 1983
PubMed
Summary
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This study presents a novel photosensor element for charge-coupled device (CCD) imaging arrays, offering a logarithmic response to light intensity. This innovation enables more precise light measurements in advanced imaging applications.

Area of Science:

  • Optoelectronics
  • Semiconductor device physics
  • Image sensor technology

Background:

  • Charge-coupled device (CCD) imaging arrays are crucial for digital imaging.
  • Achieving a logarithmic response in photosensors is essential for wide dynamic range imaging.
  • Existing photosensor elements often have limitations in dynamic range and integration.

Purpose of the Study:

  • To develop a novel photosensor element for CCD imaging arrays.
  • To achieve a logarithmic relationship between incident light intensity and injected charge.
  • To enable enhanced performance in linear CCD imaging arrays.

Main Methods:

  • A photosensor element comprising a photodiode directly coupled to a two-stage MOSFET common source amplifier was designed.
  • The element was engineered for integration into linear CCD imaging arrays with a 25-micrometer period.

Related Experiment Videos

  • Characterization involved measuring the response to varying incident light intensities.

    • Main Results:

    • The photosensor element demonstrated a logarithmic response over a 68.6-dB range of incident light intensity.
    • A sensitivity of 55 mV/decade of light intensity was achieved.
    • The element's compact size (25 x 100 microm) facilitates integration into existing array designs.

    Conclusions:

    • The developed photosensor element effectively provides a logarithmic response for CCD imaging.
    • This design offers a significant advancement for high dynamic range imaging applications.
    • The element's characteristics are well-suited for incorporation into linear CCD imaging arrays.