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Proceedings Paper

4.1-megapixel JFET imaging sensor LBCAST
Author(s): Tadao Isogai; Tomohisa Ishida; Atsushi Kamashita; Satoshi Suzuki; Masahiro Juen; Tsuneyuki Kazama
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Paper Abstract

A new type of imaging sensor suitable for digital SLR cameras has been developed. Each pixel in the sensor comprises a buried photodiode, a junction field-effect transistor (JFET), a transfer gate, two reset gates, and a reset drain. The JFET receives signal charge directly from the buried photodiode through the transfer gate and outputs the converted voltage signal, while the reset gate together with the reset drain controls both resetting and selecting operations of the JFET. The pixel does not have a floating diffusion nor a row select gate, resulting in a simplified structure, an increased fill factor and a better production yield. Another feature of the sensor is the parallel readout scheme. Signals from green pixels arrayed in a checker pattern are read out from one output terminal, while those from red and blue pixels are read out, row-by-row, from the other output terminal. This enables high-speed readout without introducing fixed pattern noise. Total and effective pixel numbers are 4.26 and 4.08 mega respectively. A pixel size is 9.4um square with a fill factor of 36%. Power consumption is 600mW under consecutive operation mode of 9.3 frames/sec. Saturation output voltage is 700mV with a noise floor of 0.20mVrms, having a dynamic range of about 70dB including the camera system.

Paper Details

Date Published: 7 June 2004
PDF: 6 pages
Proc. SPIE 5301, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications V, (7 June 2004); doi: 10.1117/12.540315
Show Author Affiliations
Tadao Isogai, Nikon Corp. (Japan)
Tomohisa Ishida, Nikon Corp. (Japan)
Atsushi Kamashita, Nikon Corp. (Japan)
Satoshi Suzuki, Nikon Corp. (Japan)
Masahiro Juen, Nikon Corp. (Japan)
Tsuneyuki Kazama, Nikon Corp. (Japan)

Published in SPIE Proceedings Vol. 5301:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications V
Nitin Sampat; Morley M. Blouke; Ricardo J. Motta, Editor(s)

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