高光谱应用的带可调复位时间CDS的低噪声红外焦平面读出电路
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1.中国科学院上海技术物理研究所;2.中国科学院上海技术物理研究所中科院红外成像材料与器件重点实验室

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Low Noise ROIC integrated with Correlated Double Sampling with Adjustable Interval for Hyperspectral Applications
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1.中国科学院上海技术物理研究所;2.Key Laboratory of Infrared Imaging Materials and Detectors,Shanghai Institute of Technical Physics,Chinese Academy of Sciences

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    摘要:

    低辐射量的高光谱应用对红外焦平面读出电路(ROIC)提出了低噪声的设计要求。相关双采样(CDS)是常用的减少噪声的结构。本文通过调节钳位和采样保持之间的时间间隔来改进CDS,可灵活消除低频噪声。采用180nm CMOS工艺设计和制造了640×512规模,15μm 像元中心距的读出电路。输入级集成了低噪声CTIA与本文提出的可调复位时间CDS(AICDS)。所设计的时序产生器使CDS复位时间可以延长0~270个时钟周期。通过延长复位时间减少这个时间间隔,噪声电子数可以由39 e-减少到18.3e-。SPECTRE仿真结果和实验测试结果证实了提出的AICDS结构可以提升高光谱应用读出电路的噪声性能,因此可以广泛应用。

    Abstract:

    Low noise is a key requirement of readout integrated circuit (ROIC) in hyperspectral applications for its low radiation. Correlated double sampling (CDS) is commonly used to suppress noise. In this paper, CDS is improved by adjusting the time interval between the clamp and sample-and-hold (SH), which can filter low-frequency noise flexibly. A 640×512, 15μm pixel pitch ROIC is designed and fabricated in 180nm CMOS process. The input stage consists of low-noise capacitive trans-impedance amplifier (CTIA) and CDS with adjustable interval (AICDS). A timing generator is proposed to extend the CDS reset time from 0 to 270 clock cycles. By extending reset time to decrease the time interval, the noise electrons are significantly decreased from 39 e- to 18.3 e-. The SPECTRE simulation and the experimental results corroborate that the proposed structure AICDS can optimize noise performance of hyperspectral ROIC, thus can be widely used.

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历史
  • 收稿日期:2023-08-23
  • 最后修改日期:2023-10-30
  • 录用日期:2023-11-03
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