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Applied Optics

Applied Optics


  • Vol. 22, Iss. 22 — Nov. 15, 1983
  • pp: 3569–3571

Log-converting processor element for CCD linear imaging arrays

S. H. Chang and J. T. Boyd  »View Author Affiliations

Applied Optics, Vol. 22, Issue 22, pp. 3569-3571 (1983)

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A photosensor element suitable for incorporation into charge-coupled device (CCD) imaging arrays in which the charge injected into the CCD is proportional to the logarithm of incident light intensity is presented. The photosensor element consists of a photodiode directly coupled to a two-stage MOSFET common source amplifier. This element occupies an area of 25 × 100 μm and is arranged so that it could be incorporated into a linear CCD imaging array having a period of 25 μm. A logarithmic response is measured over a 68.6-dB range of incident light intensity with a sensitivity of 55 mV/decade of light intensity.

© 1983 Optical Society of America

Original Manuscript: June 20, 1983
Published: November 15, 1983

S. H. Chang and J. T. Boyd, "Log-converting processor element for CCD linear imaging arrays," Appl. Opt. 22, 3569-3571 (1983)

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