一种改进型天文应用低噪声红外探测器读出电路结构设计
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摘要
在短波红外天文探测应用中,背景辐射极低、信号电流极小,每秒仅产生几个光电子,为了实现较高的信噪比,探测器应具有极低的噪声。在目前国际主流天文应用红外读出电路源随器(SFD)结构的基础上,提出了一种改进型读出电路输入级结构设计,即行共用模块的单位增益缓冲器(UB)结构,在电路仿真中,实现了输入级等效输入噪声小于1e~-,线性度为0.994。
In the applications of shortwave infrared astrosurveillance,both the background radiation and the photocurrent are extremely small,and vary few photoelectrons will be generated in each second.So it demands that the ROIC must have ultralow noise performance.In this paper,an improved ROIC unit structure is proposed based on several astronomical infrared source follower per detector structures.The unit structure is a unit buffer with part of the devices shared in column.The new input unit achieves an extremely low noise level of lower than 1 e~- and linearity of 0.994.
In the applications of shortwave infrared astrosurveillance,both the background radiation and the photocurrent are extremely small,and vary few photoelectrons will be generated in each second.So it demands that the ROIC must have ultralow noise performance.In this paper,an improved ROIC unit structure is proposed based on several astronomical infrared source follower per detector structures.The unit structure is a unit buffer with part of the devices shared in column.The new input unit achieves an extremely low noise level of lower than 1 e~- and linearity of 0.994.
引文
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[8]艾伦,霍尔伯格.CMOS模拟集成电路设计[M].冯军,等译.第2版.北京:电子工业出版社,2005.Allen P E,Holberg D R.Research and Implementation of CMOS-TDI Image Sensor[M].Feng Jun,et al.transl.2nd Edi.Beijing:Publishing House of Electronics Industry,2005.
[2] Horner S D,Rieke M J.The near-infrared camera(NIRCam)for the James Webb space telescope(JWST)[C]//SPIE Astronomical Telescopes+Instrumentation Inter.Society for Optics and Photonics,2004:628-634.
[3] Rauscher B J,Boehm N,Cagiano S,et al.New and better detectors for the JWST near-infrared spectrograph[J].Publications of the Astronomical Society of the Pacific,2014,126(942):739.
[4] Bruno F,Martineau L,Sanson E,et al.Infrared ROIC for very low flux and very low noise applications[J].Proc.SPIE,2011,8176(3):6012-6015.
[5] Johnson J F,Lomheim T S.Focal-plane signal and noise model-CTIA ROIC[J].IEEE Trans.on Electron Devices,2009,56(11):2506-2515.
[6] Kozlowski L J,Montroy J T,Vural K,et al.Ultralow-noise infrared focal plane array status[J].Proc.SPIE,1998,3436(1):162-171.
[7]毕查德·拉扎维.模拟CMOS集成电路设计[M].陈贵灿,等译.西安:西安交通大学出版社,2003.Behzad·Razavi.Analog CMOS Integrated Circuit Design[M].Chen Guican,et al.transl.Xian:Xian Jiaotong University Press,2003.
[8]艾伦,霍尔伯格.CMOS模拟集成电路设计[M].冯军,等译.第2版.北京:电子工业出版社,2005.Allen P E,Holberg D R.Research and Implementation of CMOS-TDI Image Sensor[M].Feng Jun,et al.transl.2nd Edi.Beijing:Publishing House of Electronics Industry,2005.