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Proceedings Paper

Long linear arrays with time delay integration and element deselection
Author(s): C. P. Arthurs
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Paper Abstract

GEC-Marconi infra-red has developed a sensor technology based on lateral collection CdHgTe photodiode arrays mounted on custom designed CMOS multiplexer integrated circuits. The availability of submicron silicon processes has enabled a very high degree of functionality to be integrated within the detector thereby simplifying the overall system design. This paper describes a generic architecture that finds particular application for advanced infrared search-and-track, surveillance and high performance imaging applications. These applications require the highest possible performance and are therefore based on time-delay and integration (TDI) to enhance the signal-to-noise ratio, and detector element redundancy with defective element deselection (DED) to give resultant arrays with no dropouts. The detectors have fully variable integration period control, selectable integration capacitors, and a signal-to-noise enhancement capability at low infrared flux levels. The overall power consumption is low rendering the detectors suitable for engine cooling. The architecture is based on a number of unit cell designs and is readily adaptable to a wide range of configurations. The unit capacitor sizes within the design being rescaled to accommodate the required signal levels. In this way the numbers of elements in TDI and the number of TDI channels can be matched to the end application requirements. The architecture is applicable to both long and medium wave detectors. TDI channels are typically composed of 8 or 10 elements and in excess of 700 channels have been demonstrated. The results obtained from a number of prototype detectors are presented.

Paper Details

Date Published: 13 August 1997
PDF: 8 pages
Proc. SPIE 3061, Infrared Technology and Applications XXIII, (13 August 1997); doi: 10.1117/12.280366
Show Author Affiliations
C. P. Arthurs, GEC-Marconi Infrared Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 3061:
Infrared Technology and Applications XXIII
Bjorn F. Andresen; Marija Strojnik, Editor(s)

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