5 August 2009 A new interpolation arithmetic based readout signals process method for infrared imaging system applications
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A new readout signals process circuit for infrared focal plane array (IR FPA) applications is proposed. In the proposed structure the continuous-time current signals from the detector array are mirrored, amplified, integrated on the integration capacitors and changed to discrete analog voltage signals. Next, these voltage signals are amplified and modulated by a group of encoded signals from the column buses, then fed to a multiple-input analog adder to generate a single serial output data stream. The generated single serial data stream is transferred to the mitigate noise circuit and is converted to digital signals by the A/D converter. For very large format detector arrays applications the speed restriction of the time-multiplexing circuitry and the A/D converter will be released. Since no scan technique has been used, all the output signals from an entire row in the detector array have been readout simultaneously without loss of optical power, the scalability of the photon-signals, the readout efficiency and the accuracy of the imaging system will be improved. Theory analysis and experimental results show that the proposed idea is reasonable and efficient. The proposed readout method is a solid option for large format infrared detector arrays and highly integrated infrared imaging system applications. In addition, the proposed idea also can be used for other active and passive imaging readout integrated circuits.
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Xinyi Li, Suying Yao, Yiqiang Zhao, "A new interpolation arithmetic based readout signals process method for infrared imaging system applications", Proc. SPIE 7383, International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, 738312 (5 August 2009); doi: 10.1117/12.834991; https://doi.org/10.1117/12.834991

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