陈楠, 张济清, 毛文彪, 李雄军, 宋林伟, 高玲, 姚立斌. 大动态范围、高灵敏度红外焦平面数字像元读出电路技术(特邀)[J]. 红外与激光工程, 2022, 51(3): 20210821. DOI: 10.3788/IRLA20210821
引用本文: 陈楠, 张济清, 毛文彪, 李雄军, 宋林伟, 高玲, 姚立斌. 大动态范围、高灵敏度红外焦平面数字像元读出电路技术(特邀)[J]. 红外与激光工程, 2022, 51(3): 20210821. DOI: 10.3788/IRLA20210821
Chen Nan, Zhang Jiqing, Mao Wenbiao, Li Xiongjun, Song Linwei, Gao Ling, Yao Libin. High-dynamic-range and high-sensitivity IRFPA digital-pixel ROIC technology (Invited)[J]. Infrared and Laser Engineering, 2022, 51(3): 20210821. DOI: 10.3788/IRLA20210821
Citation: Chen Nan, Zhang Jiqing, Mao Wenbiao, Li Xiongjun, Song Linwei, Gao Ling, Yao Libin. High-dynamic-range and high-sensitivity IRFPA digital-pixel ROIC technology (Invited)[J]. Infrared and Laser Engineering, 2022, 51(3): 20210821. DOI: 10.3788/IRLA20210821

大动态范围、高灵敏度红外焦平面数字像元读出电路技术(特邀)

High-dynamic-range and high-sensitivity IRFPA digital-pixel ROIC technology (Invited)

  • 摘要: 长波红外探测器一直以来受到读出电路电荷存储容量的限制,导致信噪比、动态范围和灵敏度都难以提升,制约了长波红外成像系统的发展和应用。文中对比分析了模拟像元和数字像元读出电路技术,介绍了数字像元焦平面的发展现状和主要架构。采用脉冲频率调制方案设计了384×288(25 µm)和256×256 (30 µm)两款数字像元读出电路,其中比较器设计提高了功耗效率和强壮性,并耦合碲镉汞探测器形成长波数字焦平面探测器组件进行测试,结果与国内外相关工作进行比较分析,峰值噪声等效温差分别达到3.4 mK和1.9 mK,动态范围达到96 dB。测试结果表明,数字像元技术显著提升了长波红外焦平面的灵敏度和动态范围,是提高红外探测器性能的有效途径。

     

    Abstract: The signal-noise ratio, dynamic range and sensitivity of long-wavelength (LW) infrared detector are limited by the charge capacity of digital readout integrated circuit (ROIC), which restricts the development and application of LW infrared imaging systems. The comparison and analysis of analog pixel and digital pixel ROIC technology were presented in this paper, the research status and main architectures of digital pixel focal plane array (FPA) were introduced. The 384×288 (25 µm) and 256×256 (30 µm) digital-pixel ROICs were designed with pulse frequency modulation scheme, and the designed comparator improved the power efficiency and robustness. Based on this, the digital LW FPA detector modules were designed with HgCdTe detector arrays, which measurement results were compared and analyzed with related works. The measured peak noise equivalent temperature difference are 3.4 mK and 1.9 mK, respectively, and the dynamic range achieves 96 dB. It’s confirmed that the digital pixel technology significantly improves the sensitivity and dynamic range of LW IRFPA, which manifests that this technology is a promising way to improve the performance of infrared detector.

     

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