High-Speed High-Dynamic Range Linear Array

Leland Ray Hud son; Chin-Ron Chung; Hsin-Fu Tseng; Savvas G. Chamberlain; William D. Washkurak

doi:10.1117/12.948286

7 December 1988 High-Speed High-Dynamic Range Linear Array

Leland Ray Hud son, Chin-Ron Chung, Hsin-Fu Tseng, Savvas G. Chamberlain, William D. Washkurak

Proceedings Volume 0972, Infrared Technology XIV; (1988) https://doi.org/10.1117/12.948286
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

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.

Citation Download Citation

Leland Ray Hud son, Chin-Ron Chung, Hsin-Fu Tseng, Savvas G. Chamberlain, and William D. Washkurak "High-Speed High-Dynamic Range Linear Array", Proc. SPIE 0972, Infrared Technology XIV, (7 December 1988); https://doi.org/10.1117/12.948286

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