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Proceedings Paper

High-Speed High-Dynamic Range Linear Array
Author(s): Leland Ray Hud son; Chin-Ron Chung; Hsin-Fu Tseng; Savvas G. Chamberlain; William D. Washkurak
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Paper Abstract

Present day optical signal processing using acousto-optical (A-0) diffraction is well-known for its inherent ability to perform wideband spectrum analysis on a real-time basis. This type of application requires a high-speed high-dynamic range linear array. In this paper, we describe a novel photodetector which provides an analog voltage of a few volts when the incident radiation intensity varies over a range of seven orders of magnitude. Its principle of operation utilizes the subthreshold effect of short channel MOSFET's, which is normally regarded as a detrimental effect. However, the phenomenon has been exploited in this case to inject excess collected photocharge into a common drain, thus, giving the device its logrithmic response. The detector array consists of 108 photoelements arranged in a linear array. The structure uses an epitaxial wafer construction for low crosstalk characteristics. There are six output registers each consisting of an eighteen-stage CCD and a buffer amplifier. Each of the six output multiplexers runs at a speed of 20 MHz, and since these are readout in parallel, the effective speed of the device is 120 Megapixels/second. The full well capacity is 1.17 million electrons, crosstalk at the second nearest pixel is down-51 dB, the electron sensitivity of the device is 1.2 AV/electron, and the power dissipation of the device is less than 170 mW.

Paper Details

Date Published: 7 December 1988
PDF: 6 pages
Proc. SPIE 0972, Infrared Technology XIV, (7 December 1988); doi: 10.1117/12.948286
Show Author Affiliations
Leland Ray Hud son, EG&G Reticon (United States)
Chin-Ron Chung, EG&G Reticon (United States)
Hsin-Fu Tseng, EG&G Reticon (United States)
Savvas G. Chamberlain, Dalsa, Inc (Canada)
William D. Washkurak, Dalsa, Inc (Canada)


Published in SPIE Proceedings Vol. 0972:
Infrared Technology XIV
Irving J. Spiro, Editor(s)

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