On Chip CCD Signal Processing Circuits are presented which enhance Focal Plane performance in scanned imaging systems. A Charge Input Mode Programmable Signal CHIMPS Compressor increases dynamic range by providing programmable signal amplitude compression at the detector. Compression breakpoint and ratio are determined by clocking waveforms. A CCD Multiplier provides Automatic Responsivity Control ARC to reduce TDI column to column responsivity non-uniformities. A GAMMA - APERTURE circuit provides two functions: (1) high frequency boost to compensate for losses due to scanning of detector apertures, and (2) a scene processing gamma function which attenuates high level, low frequency signals. This circuit provides increased useable dynamic range when observing scene detail contained in large scene areas which have large differences in amplitude.
W. E. Jensen,
"On Focal Plane Charge-Coupled Device (CCD) Signal Processing Circuits", Proc. SPIE 0217, Advances in Focal Plane Technology, (7 May 1980); doi: 10.1117/12.958476; https://doi.org/10.1117/12.958476