Photodetector array

Details Photodetector array Photodetector array

1996-02-13

1998-01-13

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502141, 257448, 348302, H01J 4014

Patent

active

057082634

ABSTRACT:
A photodetector array for sensing radiant energy is described incorporating photodetectors, a respective semiconductor region for holding charge and two transistors coupled in series at each pixel, and a column load transistor. An amplifier at the load transistor may provide gain while providing dynamic range compression and a reduction in signal noise due to resetting of the voltage at the semiconductor regions. The invention overcomes the problem of CMOS manufacturing of photodetector arrays and for a simplified circuit per pixel to enable denser arrays and reduced noise.

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patent: 5276407 (1994-01-01), Mead et al.
patent: 5304950 (1994-04-01), Martin et al.
patent: 5325073 (1994-06-01), Hasegawa
M. H. White et al., "Characterization of Surface Channel CCD Image Arrays at Low Light Levels", IEEE Journal of Solid-State Circuits, vol. sc-9, No. 1, pp. 1-13, Feb. 1974.
S. K. Mendis et al., "A 128.times.128 CMOS Active Pixel Image Sensor for Highly Integrated Imaging Systems", IEEE, 0-7803, 1450, 6, pp. 22.6.1-22.6.4, Jan. 1993.

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