1. A CMOS active pixel sensor with embedded electronic shutter and A/D converter
- Author
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Jae-Hyoun Park, Pyung Choi, Jang-Kyoo Shin, Hyung-June Yoon, Sung-Ho Lee, Sang-Ho Seo, and Mi-Young Do
- Subjects
Engineering ,CMOS sensor ,Pixel ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Analog-to-digital converter ,Signal ,law.invention ,Light intensity ,Sampling (signal processing) ,law ,Electronic engineering ,Optoelectronics ,Image sensor ,business ,Electronic circuit - Abstract
A CMOS active pixel sensor has been designed and fabricated using standard 2-poly and 4-metal CMOS processing technology. The CMOS active pixel sensor has been made up of a unit pixel having a highly sensitive PMOSFET photo-detector and electronic shutters that can control the light exposure time to the PMOSFET photo-detector, correlated-double sampling (CDS) circuits, and an 8-bit two-step flash analog to digital converter (ADC) for digital output. This sensor can obtain a stable photo signal in a wide range of light intensity. It can be realized with a special function of an electronic shutter which controls the light exposure-time in the pixel. Moreover, this sensor had obtained the digital output using an embedded ADC for the system integration. The designed and fabricated image sensor has been implemented as a pixel array. The area of the unit pixel is and its fill factor is about 35 %.
- Published
- 2005
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