Volume 49 Issue 1
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Yao Libin, Chen Nan. High-performance low noise digital readout circuit[J]. Infrared and Laser Engineering, 2020, 49(1): 0103009-0103009(10). doi: 10.3788/IRLA202049.0103009
Citation: Yao Libin, Chen Nan. High-performance low noise digital readout circuit[J]. Infrared and Laser Engineering, 2020, 49(1): 0103009-0103009(10). doi: 10.3788/IRLA202049.0103009

High-performance low noise digital readout circuit

doi: 10.3788/IRLA202049.0103009
  • Received Date: 2019-11-01
  • Rev Recd Date: 2019-11-13
  • Publish Date: 2020-01-28
  • It's the trend of information technology development that infrared focal plane array (FPA) outputs digital signal directly, the critical technique is the digital readout integrated circuit (ROIC). The architecture of digital ROIC was introduced in this paper after the summary of related research status. The sources and influence of temporal noise and spatial noise were analyzed in detail, then the design guide for low noise was also shown. In addition, two digital ROICs were designed based on the discussion of linearity, dynamic range and frame rate. The first ROIC was implemented with column-level ADCs, which was used for 640×512 digital FPA. The measurement results show that the readout noise of ROIC is 150 μV, and the NETD with mid-wave infrared detectors is 13 mK. Digital pixel architecture is used for the second ROIC, which is connected to 384×288 long-wave infrared FPA. The measured NETD is less than 4 mK, and the dynamic range is larger than 90 dB. The max frame rate achieves 1 000 Hz. The two ROIC prototypes effectively improve the sensitivity, dynamic range and frame rate of infrared FPA, which confirms the advantages of digital ROIC technology to the performance development of infrared detectors.
  • [1] Oiknine S, Calahorra Z, Uri E, et al. Pelican-SCD's 640×512, 15 μm pitch InSb detector[C]//SPIE, 2007, 6542:654231.
    [2] Nesher O, Pivnik I, Ilan E, et al. High resolution 1280×1024, 15 μm pitch compact InSb IR detector with on-chip ADC[C]//SPIE, 2009, 7298:72983K.
    [3] Ilan E, Shiloah N, Dlkind S, et al. A 3 M pixel ROIC with 10 μm pixel pitch and 120 Hz frame rate[C]//SPIE, 2013, 8659:86590A.
    [4] Reibel Y, Pere N, Augey T, et al. Getting small, new 10 μm pixel pitch cooled infrared products[C]//SPIE, 2014, 9070:907034.
    [5] Kelly M, Berger R, Colonero C, et al. A design and testing of an all-digital readout integrated circuitfor infrared focal plane arrays[C]//SPIE, 2005, 5902:59020J.
    [6] Bisotto S, Borniol E, Mollard L, et al. A 25μm pitch LWIR staring focal plane array with pixel-level 15-bit ADC ROIC achieving 2 mK NETD[C]//SPIE, 2010, 7834:78340J.
    [7] Chen N, Zhang J, Zhong S, et al. A low-noise CMOS image sensor with digital correlated multiple sampling[J]. IEEE Transanctions on Circuits and Systems I, 2018, 65(1):84-94.
    [8] Chen N, Li Z, Zhong S, et al. A 15-bit incremental sigma-delta ADC for CMOS image sensor[C]//SPIE, 2015, 9522:95222A.
    [9] Zhang J, Li Z, Zhong S, et al. A novel data transmission circuit for digital image sensors[C]//SPIE, 2015, 9522:95221G.
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High-performance low noise digital readout circuit

doi: 10.3788/IRLA202049.0103009
  • Kunming Institute of Physics, Kunming 650223, China

Abstract: It's the trend of information technology development that infrared focal plane array (FPA) outputs digital signal directly, the critical technique is the digital readout integrated circuit (ROIC). The architecture of digital ROIC was introduced in this paper after the summary of related research status. The sources and influence of temporal noise and spatial noise were analyzed in detail, then the design guide for low noise was also shown. In addition, two digital ROICs were designed based on the discussion of linearity, dynamic range and frame rate. The first ROIC was implemented with column-level ADCs, which was used for 640×512 digital FPA. The measurement results show that the readout noise of ROIC is 150 μV, and the NETD with mid-wave infrared detectors is 13 mK. Digital pixel architecture is used for the second ROIC, which is connected to 384×288 long-wave infrared FPA. The measured NETD is less than 4 mK, and the dynamic range is larger than 90 dB. The max frame rate achieves 1 000 Hz. The two ROIC prototypes effectively improve the sensitivity, dynamic range and frame rate of infrared FPA, which confirms the advantages of digital ROIC technology to the performance development of infrared detectors.

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