컬럼 커패시터와 피드백 구조를 이용한 CMOS 이미지 센서의 동작 범위 확장
Dynamic Range Extension of CMOS Image Sensor with Column Capacitor and Feedback Structure
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초록
This paper presents a wide dynamic range complementary metal oxide semiconductor (CMOS) image sensor with column capacitorand feedback structure. The designed circuit has been fabricated by using 0.18ìm 1-poly 6-metal standard CMOS technology. This sensorhas dual mode operation using combination of active pixel sensor (APS) and passive pixel sensor (PPS) structure. The proposedpixel operates in the APS mode for high-sensitivity in normal light intensity, while it operates in the PPS mode for low-sensitivity inhigh light intensity. The proposed PPS structure is consisted of a conventional PPS with column capacitor and feedback structure. Thecapacitance of column capacitor is changed by controlling the reference voltage using feedback structure. By using the proposed structure,it is possible to store more electric charge, which results in a wider dynamic range. The simulation and measurement results demonstratewide dynamic range feature of the proposed PPS.
Abstract
This paper presents a wide dynamic range complementary metal oxide semiconductor (CMOS) image sensor with column capacitorand feedback structure. The designed circuit has been fabricated by using 0.18ìm 1-poly 6-metal standard CMOS technology. This sensorhas dual mode operation using combination of active pixel sensor (APS) and passive pixel sensor (PPS) structure. The proposedpixel operates in the APS mode for high-sensitivity in normal light intensity, while it operates in the PPS mode for low-sensitivity inhigh light intensity. The proposed PPS structure is consisted of a conventional PPS with column capacitor and feedback structure. Thecapacitance of column capacitor is changed by controlling the reference voltage using feedback structure. By using the proposed structure,it is possible to store more electric charge, which results in a wider dynamic range. The simulation and measurement results demonstratewide dynamic range feature of the proposed PPS.
참고문헌 (23)
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