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Proceedings Paper

Conversion gain non-linearity and its correction in hybridised near infrared detectors
Author(s): Nagaraja Bezawada; Derek Ives; David Atkinson
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Paper Abstract

The conversion gain in hybridised near infrared detectors with Source Follower per Detector unit cells changes non-linearly as the signal integrates on the junction capacitance of the detector diodes[1,2]. However, the non-linearity in the measured conversion gain as calculated from the conventional photon transfer technique (~15% in VIRGO-2K for example) is higher than the non-linearity noticed at the detector output (~4% in the same detectors). This paper presents experimental data from the VIRGO-2K, Aladdin-III and Hawaii-1RG detectors which is used to highlight this discrepancy and thus show the shortcomings of the use of the photon transfer technique with such non-linear detectors. The mechanism for the changing detector node capacitance with integrating signal is explained. A method for correcting the measured conversion gain to account for this non-linearity has been implemented on the data from the same detectors and will be presented. If not corrected, this non-linearity can be another source of error that could cause an over-estimation of the detector performance parameters (as is the case with the inter-pixel capacitance).

Paper Details

Date Published: 14 September 2007
PDF: 11 pages
Proc. SPIE 6690, Focal Plane Arrays for Space Telescopes III, 669005 (14 September 2007); doi: 10.1117/12.732454
Show Author Affiliations
Nagaraja Bezawada, UK Astronomy Technology Ctr. (United Kingdom)
Derek Ives, UK Astronomy Technology Ctr. (United Kingdom)
David Atkinson, UK Astronomy Technology Ctr. (United Kingdom)

Published in SPIE Proceedings Vol. 6690:
Focal Plane Arrays for Space Telescopes III
Thomas J. Grycewicz; Cheryl J. Marshall; Penny G. Warren, Editor(s)

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