Research on the readout noise suppression method for digital correlated double sampling

作     者：Wei Duan Qian Song Ming-Zhi Wei Zhao-Wang Zhao Wei Wang Yu-Heng Zhang Zhi-Wei Feng Wei Duan;Qian Song;Ming-Zhi Wei;Zhao-Wang Zhao;Wei Wang;Yu-Heng Zhang;Zhi-Wei Feng

作者机构：National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Optical AstronomyNational Astronomical ObservatoriesBeijing 100101China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2021年第21卷第1期

页      面：127-135页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：the National Natural Science Foundation of China (Grant No. 11403050) 

主　　题：instrumentation:detectors methods:analytical methods:numerical 

摘      要：As the areas of CCD detectors and CCD mosaics have become larger and larger,the number of readout channels in astronomical cameras has increased accordingly to keep the image readout time within an acceptable *** the large area cameras or the mosaic cameras,the analog Correlated Double Sampling(aCDS)circuit used in traditional astronomical cameras for suppressing readout noise is difficult to integrate into the camera controllers within the constraints of the space and energy ***,digital CDS(dCDS)technology has been developed to solve this problem,which also offers novel analysis and noise suppression *** this study,a mathematical model is presented to conveniently analyze the frequency characteristic of a dCDS circuit,which is then simulated by a numerical method for investigating the noise suppression capability with different sampling ***,using this model,the extreme point with lowest readout noise can be predicted for a certain dCDS model;and for a specific CCD readout frequency,readout noise can be suppressed by selecting the proper dCDS model.A testing system is then constructed for validating the efficiency of the proposed method.