11 November 2014 Design of a ROIC with high dynamic range for LWIR FPAs
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Abstract
In this paper, a high performance readout integrated circuit (ROIC) designed for long wave infrared (LWIR) detectors is introduced, which has high dynamic range (HDR). To accommodate the wide scene dynamic range requirement, special circuit architecture is used to the input unit cell. A capacitive feedback transimpedance amplifier (CTIA) as input circuit is used to provide high injection efficiency, low input resistance, good linearity, precise voltage bias. Because of the restriction of the layout area, four unit cells will share an integration capacitor and each unit cell has a correlated double sampling (CDS) circuit, which allows the infrared focal plane arrays (IRFPA) to be operated in full frame snapshot mode and provides the maximum integration time available. The charge transfer circuit is used and we don't need to consider the drive ability of the unit cell. The simulation results confirm that the ROIC provides over a factor of 70dB dynamic range with the 5.0v power supply.
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Yongcheng Zhai, Yongcheng Zhai, Ruijun Ding, Ruijun Ding, } "Design of a ROIC with high dynamic range for LWIR FPAs", Proc. SPIE 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III, 927518 (11 November 2014); doi: 10.1117/12.2071838; https://doi.org/10.1117/12.2071838
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