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Registered LOW-VOLTAGE IMAGE SENSOR AND METHOD OF DRIVING TRANSFER TRANSISTOR THEREOF

저전압용 이미지 센서 및 이미지 센서의 트랜스퍼 트랜지스터 구동 방법
이미지 확대
Inventors
Bongki Mheen, 송영주, Kim Mi Jin, Park Seong Su
Application No.
11875513 (2007.10.19)
Publication No.
20080099807 (2008.05.01)
Registration No.
7829834 (2010.11.09)
Country
UNITED STATES
Project Code
06MB1800, Integrated Development of UltraLow Power RF/HW/SW SoC, Seok Bong Hyun
Abstract
Provided are a low-voltage image sensor and a method of driving a transfer transistor thereof, which are obtained by changing the structure and driving method of a typical transfer transistor of a 4-transistor CMOS transistor, and can eliminate the influence of a voltage or physical structure of a diffusion node on a reset or transfer operation of a photodiode. The image sensor includes a light receiving device for detecting light and a signal conversion unit for reading photocharge generated by the light receiving device to an external circuit. The signal conversion unit includes a transfer transistor including at least two gate electrodes. When the photocharge is transferred to a channel of a transfer gate electrode disposed closest to a photodiode, a transfer gate electrode disposed adjacent to a diffusion node remains turned off.
KSP Keywords
CMOS transistor, Driving method, Image Sensor, Physical structure, Transfer gate, gate electrode, low voltage