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Digital correlated double sampling CCD readout characterization
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Paper Abstract

Charge Coupled Devices (CCD) are detectors widely used in astronomical observation due to their high sensitivity and high spatial resolution. The readout technique is often implemented with analog circuits. The main objective of our research is to replace the analog processing of a CCD signal with the realisation of digital processing. In doing so, low noise levels will be obtained while reducing the area and improving flexibility. Digital Correlated Double Sampling (DCDS) is a readout technique by which the CCD signal is oversampled many times allowing the CDS filter function to move from the traditional analog domain to the digital domain. Two digital processing systems have been tested using the DCDS readout technique by developing algorithms to analyze and process the digital samples taken from reading the CCD. These digital processing systems have low cost, low power and a compact package. An extensive CCD readout characterization based on Photon Transfer (PT) method has been carried out on a vacuum and controlled temperature conditions. It has also been confirmed using an Fe55 X-ray source. The power dissipation achieved is a high improvement with respect to the analog circuit and the noise values obtained are in concordance with the analog processing.

Paper Details

Date Published: 10 July 2018
PDF: 9 pages
Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 1070920 (10 July 2018); doi: 10.1117/12.2312498
Show Author Affiliations
Carlos Cruz de la Torre, Ctr. de Investigaciones Energéticas, Medioambientales y Tecnológicas (Spain)
Juan de Vicente Albendea, Ctr. de Investigaciones Energéticas, Medioambientales y Tecnológicas (Spain)

Published in SPIE Proceedings Vol. 10709:
High Energy, Optical, and Infrared Detectors for Astronomy VIII
Andrew D. Holland; James Beletic, Editor(s)

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