Analysis of photoelectric conversion characteristics under knee control operation for CCD imagers

Author

Nakamura, Nobuo ; Matsunaga, Yoshiyuki ; Egawa, Yoshitaka ; Endo, Yukio ; Tango, Hiroyuki ; Yoshida, Okio

Author_Institution

Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan

Volume

41

Issue

12

fYear

1994

fDate

12/1/1994 12:00:00 AM

Firstpage

2291

Lastpage

2296

Abstract

A high-light signal suppression operation, knee control operation, was evaluated in order to apply to a STACK-CCD of 2/3-in 2 M-pixel high definition television (HDTV) imager overlaid with an amorphous silicon photoconversion layer. A smooth bend was observed in the measured photoconversion characteristics near a knee point. It was analyzed theoretically by applying a subthreshold current of the MOSFET in weak inversion for skimming excess charges and reading out signal charges through a field shift gate. The calculated curve showed good agreement with the measured curve. Effectiveness of the knee control operation using the field shift gate was shown experimentally and theoretically over that using a conventional vertical overflow drain for IT-CCD imagers

Keywords

CCD image sensors; high definition television; television cameras; 2 Mpixel; CCD imagers; MOSFET; STACK-CCD; excess charges; field shift gate; high definition television; high-light signal suppression operation; knee control operation; photoelectric conversion characteristics; subthreshold current; weak inversion; Amorphous silicon; Blanking; Charge coupled devices; Charge-coupled image sensors; Dynamic range; HDTV; Image analysis; Image converters; Knee; Layout;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.337441

Filename

337441