21 October 2005 CMOS pixels crosstalk mapping and its influence on measurements accuracy for space applications
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Abstract
Due to different local intra-pixel sensitivity and crosstalk between neighboring pixels, the Pixel Response Function of detectors (PRF - signal of the pixel as a function of a point source position) is generally non-uniform. This may causes problems in space application such as aperture photometry and astrometry (centroiding). For imaging applications, an important crosstalk yields to a loss of resolution, i.e. a poor image quality, commonly quantified by the Modulation Transfer Function (MTF). So, crosstalk study is of primary importance for our applications. A dedicated test chip (using a technology optimized for imaging applications) has been developed in order to get both MTF data and influence of the various areas of the pixel to its own response and the one of its neighbors. The results obtained with pixel kernels and direct MTF measurements, performed on the same chip at different wavelengths, are analyzed and compared in order to correlate them. So it is possible to draw conclusions -that can be applied at the design level - allowing to get a better MTF and to minimize errors on aperture photometry and centroiding computation.
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M. Estribeau, P. Magnan, "CMOS pixels crosstalk mapping and its influence on measurements accuracy for space applications", Proc. SPIE 5978, Sensors, Systems, and Next-Generation Satellites IX, 597813 (21 October 2005); doi: 10.1117/12.628955; https://doi.org/10.1117/12.628955
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