| Measurement and analysis of pixel geometric and diffusion modulation transfer function components in photodiode active pixel sensors (2004) | |||||||||
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| Measurement and Analysis Pixel Geometric and Diffusion Modulation Transfer Function Components Photodiode Active Pixel Sensors Tracy Dutton Jaewon Kang Terrence Lomheim Richard Boucher Ralph Shim and Mark Nelson The Aerospace Corporation Sensor System Subdivision Box Los Angeles California USA Bedabrata Pain Christopher Wrigley and Xinyu Zheng Jet Propulsion Laboratory Oak Grove Drive Pasadena California USA Abstract this paper describe MTF and spot scan measurements and associated analyses aimed understanding and separating the behavior the geometric and diffusion MTF components active pixel sensors APS designed the Jet Propulsion Laboratory For insight into the pixel geometric MTF especially for complex APS pixel topologies maximum information gained spot scanning the pixel This followed the dimensional Fourier Transform this spot scanning data with appropriate normalization obtain the pixel geometric MTF Figure displays the results scanning focused spot microns helium neon laser wavelength two dimensions across single pixel JPL APS the called device which has micron pixel pitch The focused spot step size was microns the pixel geometric response map Figure corresponds grid about data points The pixel architecture the device has dog bone shaped photodiode the center the micron pixel and fill factor about with the readout circuitry located the top and bottom the figure and metal bus lines the right and left the figure Figure shows orthogonal slices the dimensional MTF calcula | |||||||||
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