Title :
A novel bipolar imaging device - BASIC (BAse stored imager in CMOS Process)
Author :
Kook, Youn-Jae ; Cheon, Jun-Ho ; Lee, Jong-Ho ; Park, Young-June ; Min, Hong-Shick
Author_Institution :
Sch. of Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
A new pixel structure named base stored imager in CMOS process (BASIC), is proposed and realized with a conventional 1.5 μm CMOS process. The BASIC cell comprises three pMOSFETs and a new photosensor, which has the gate-body tied nMOSFET structure. The BASIC cell achieves high responsivity because the photosensor amplifies the photogenerated electron-hole pairs. Dynamic range is improved by using the reset of the base through the pMOSFET and correlated double sampling operation. The structure and operation principles of the BASIC cell are presented together with measurement results from the fabricated samples. It is shown that the BASIC cell can be scaled down for large arrays and it is adequate for low voltage operation.
Keywords :
CMOS image sensors; image sampling; low-power electronics; 1.5 μm CMOS process; 1.5 micron; BASIC; amplification pixel; base stored imager in CMOS process; bipolar imaging device; correlated double sampling operation; dynamic range improvement; gate-body tied nMOSFET structure; high responsivity; large arrays; low voltage operation; operation principles; pMOSFETs; photogenerated electron-hole pairs; photosensor; CMOS image sensors; CMOS process; Computational Intelligence Society; Dynamic range; Image sampling; Low voltage; MOSFET circuits; Pixel; Sensor systems; System-on-a-chip;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2003.816912
