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

Authors :
Wei Wang
Wei Duan
Yuheng Zhang
Zhao-Wang Zhao
Qian Song
Zhi-Wei Feng
Mingzhi Wei
Source :
Research in Astronomy and Astrophysics. 21:013
Publication Year :
2021
Publisher :
IOP Publishing, 2021.

Abstract

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 range. For 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 consumption. Recently, digital CDS (dCDS) technology has been developed to solve this problem, which also offers novel analysis and noise suppression methods. In 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 weights. Importantly, 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.

Details

ISSN :
16744527
Volume :
21
Database :
OpenAIRE
Journal :
Research in Astronomy and Astrophysics
Accession number :
edsair.doi...........edd65587ba8b3f470e506506ec906caa
Full Text :
https://doi.org/10.1088/1674-4527/21/1/13