3 November 2016 A design on low noise imaging circuit for SWIR sensor
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SWIR (Short Wave Infrared) imaging is an important imaging technology in space remote sensing. According to the characteristics of SWIR detector, the whole scheme of low noise imaging circuit is presented in this paper. For certain key circuit which noise is sensitive in the design, such as bias generation circuit, analysis of noise sources and calculation of theoretical noise value of actual circuit which is usually ignored in previous researches are proposed in order to estimate the level of circuit noise and optimize the circuit to reduce noise. The structure of analog filter amplifier circuit is also analyzed by introducing noise-factor analytic approach, based on the analysis result some design principles of the circuit are proposed. The noise suppression methods in the design are separately analyzed in both time suppression and space suppression; some specific methods for these two kinds of measures are listed in this paper. The final experiment results indicate that the low noise imaging circuit design based on above methods is reasonable and effective, the circuit has a higher SNR and can work normally at room temperature, and the whole design meets the original requirement of low noise. This low noise circuit for SWIR detector and its methods to analyze and calculate noise value are valuable examples for future similar designs.
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Ben Fan, Ben Fan, Zhixue Han, Zhixue Han, Fei Ma, Fei Ma, Shuli Dong, Shuli Dong, } "A design on low noise imaging circuit for SWIR sensor", Proc. SPIE 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV, 1003015 (3 November 2016); doi: 10.1117/12.2242715; https://doi.org/10.1117/12.2242715

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