title: Log-converting processor element for CCD linear imaging arrays.
abstract: 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 x 100 microm and is arranged so that it could be incorporated into a linear CCD imaging array having a period of 25 microm. 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.
authors.affiliation: University of Cincinnati, Department of Electrical & Computer Engineering, Solid State Electronics Laboratory, Cincinnati, Ohio 45221, USA.
authors.forename: S H
authors.initials: SH
authors.lastname: Chang
authors.forename: J T
authors.initials: JT
authors.lastname: Boyd