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Micro digital solar attitude detector chip

A variety of candidate technologies are usable for an integrated, position-sensitive solar image detector. In most approaches the imaging arrays are read out and analyzed by a microprocessor to determine the apparent position of the sun. In contrast, we have developed a novel active pixel sensor(APS) based design that boasts all the advantages of an active pixel imager and includes analog position computation circuitry on the focal plane. In this work, we describe a Digital Solar Attitude Detector (DSAD) and housekeeping imager ASIC. The ASIC is a 200 pixel by 200 pixel position sensitive APS with associated analog support circuitry. The ASIC is fabricated on a commercial 0.5prn CMOS process. Radiation hardened by design techniques are used to mitigate radiation effects. A single FPGA provides an 12C interface and the total system dissipates less than 20 mW. KeywordsDSAD, Active Pixel Sensors, Imager, Analog Computation