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LIU Xiao-Yan, LU Jing-Bin, YANG Yan-Ji, LU Bo, WANG Yu-Sa, XU Yu-Peng, CUI Wei-Wei, LI Wei, LI Mao-Shun, WANG Juan, HAN Da-Wei, CHEN Tian-Xiang, HUO Jia, HU Wei, ZHANG Yi, ZHU Yue, ZHANG Zi-Liang, YIN Guo-He, WANG Yu, ZHAO Zhong-Yi, FU Yan-Hong, ZHANG Ya, MA Ke-Yan and CHEN Yong. A digital CDS technique and its performance testing[J]. Chinese Physics C, 2015, 39(7): 076101. doi: 10.1088/1674-1137/39/7/076101
LIU Xiao-Yan, LU Jing-Bin, YANG Yan-Ji, LU Bo, WANG Yu-Sa, XU Yu-Peng, CUI Wei-Wei, LI Wei, LI Mao-Shun, WANG Juan, HAN Da-Wei, CHEN Tian-Xiang, HUO Jia, HU Wei, ZHANG Yi, ZHU Yue, ZHANG Zi-Liang, YIN Guo-He, WANG Yu, ZHAO Zhong-Yi, FU Yan-Hong, ZHANG Ya, MA Ke-Yan and CHEN Yong. A digital CDS technique and its performance testing[J]. Chinese Physics C, 2015, 39(7): 076101.  doi: 10.1088/1674-1137/39/7/076101 shu
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Received: 2014-10-10
Revised: 2014-11-21
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A digital CDS technique and its performance testing

    Corresponding author: CHEN Yong,

Abstract: Readout noise is a critical parameter for characterizing the performance of charge-coupled devices (CCDs), which can be greatly reduced by the correlated double sampling (CDS) circuit. However, a conventional CDS circuit inevitably introduces new noise since it consists of several active analog components such as operational amplifiers. This paper proposes a digital CDS circuit technique, which transforms the pre-amplified CCD signal into a train of digital presentations by a high-speed data acquisition card directly without the noisy CDS circuit, then implements the digital CDS algorithm through a numerical method. A readout noise of 3.3 e- and an energy resolution of 121 eV@5.9 keV can be achieved via the digital CDS technique.

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