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Published July 22, 2008 | Published
Book Section - Chapter Open

Mapping electrical crosstalk in pixelated sensor arrays


Electronic coupling effects such as Inter-Pixel Capacitance (IPC) affect the quantitative interpretation of image data from CMOS, hybrid visible and infrared imagers alike. Existing methods of characterizing IPC do not provide a map of the spatial variation of IPC over all pixels. We demonstrate a deterministic method that provides a direct quantitative map of the crosstalk across an imager. The approach requires only the ability to reset single pixels to an arbitrary voltage, different from the rest of the imager. No illumination source is required. Mapping IPC independently for each pixel is also made practical by the greater S/N ratio achievable for an electrical stimulus than for an optical stimulus, which is subject to both Poisson statistics and diffusion effects of photo-generated charge. The data we present illustrates a more complex picture of IPC in Teledyne HgCdTe and HyViSi focal plane arrays than is presently understood, including the presence of a newly discovered, long range IPC in the HyViSi FPA that extends tens of pixels in distance, likely stemming from extended field effects in the fully depleted substrate. The sensitivity of the measurement approach has been shown to be good enough to distinguish spatial structure in IPC of the order of 0.1%.

Additional Information

© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration and funded through the internal Science and Technology program. We also thank Jason Rhodes for his encouragement and funding support. The detector development and procurement was sponsored by the United States Department of Energy under contract No. DE-AC02-05CH11231. The HCT FPA was provided by Chris Bebek of the Lawrence Berkeley National Laboratory. The HyViSi FPA used was provided via David Crisp and Mark Schwochert of the NASA Orbiting Carbon Observatory mission.

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