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Using dummy and pseudo-dummy amplifiers to correct for common mode CCD noise

Steele, IA, Mottram, CJ, Smith, RJ and Barnsley, RM (2014) Using dummy and pseudo-dummy amplifiers to correct for common mode CCD noise. SPIE Proceedings: High Energy, Optical, and Infrared Detectors for Astronomy VI, 9154. ISSN 0277-786X

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Some modern CCD designs provide a dummy readout amplifier that is designed to be operated with the same clock and bias signals as the true amplifier in order to provide a measurement of clock induced and other common-mode noise signals in the true amplifier readout. In general the dummy output signal is subtracted electronically from the true output signal in a differential input preamplifier before digitization. Here we report on an alternative approach where both signals are digitized and the subtraction done in software. We present the results of testing this method of operation using the ARC SDSU generation III CCD controllers and an e2v CCD231 device and find it works well, allowing a noise figure of ~ 2:2 electrons to be reached in the presence of significantly higher (~ 6 electrons) pickup noise. In addition we test the effectiveness of using unused (but still genuine) readout amplifiers on the detector to provide a pseudo-dummy output, which we also find effective in cancelling common mode noise. This provides the option of implementing noise reduction on CCDs that are not equipped with dummy outputs at the expense of overall readout speed.

Item Type: Article
Additional Information: Copyright 2014 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Uncontrolled Keywords: Science & Technology; Physical Sciences; Astronomy & Astrophysics; Optics; charged coupled device; dummy amplifier; common mode noise; read noise
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Astrophysics Research Institute
Publisher: Society of Photo-optical Instrumentation Engineers
Related URLs:
Date Deposited: 15 Apr 2016 14:26
Last Modified: 04 Sep 2021 13:01
DOI or ID number: 10.1117/12.2056602
Editors: Holland, AD and Beletic, JW
URI: https://researchonline.ljmu.ac.uk/id/eprint/3446
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