넓은 동적 범위를 가지는 CMOS Image SensorsOFD(Over Flow Drain) 픽셀 설계
OFD(Over Flow Drain) pixel architecture design of the CISwhich has wide dynamic range with a CMOS process
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초록
We propose a new image pixel architecture which has OFD(Over Flow Device) node by improving conventional 3TR pixel structure. Newly designed pixel consists of photo diode which is verified with HSPICE simulation, PMOS reset transistor, several NMOS and several PMOS transistors. Photodiode signals from each PMOS and NMOS are detected by Reset PMOS. These output signals give enough chances to detect wide operation coverage because OFD node has overflow photocurrent. According to various light intensity, we analyzed characteristic of the output voltage with a SPICE tool. Proposed pixel output has specific value which can detect possible from 0.1 μW/㎠ to 10 W/cm2 light intensity. It has wide-dynamic range of 160 dB.
Abstract
We propose a new image pixel architecture which has OFD(Over Flow Device) node by improving conventional 3TR pixel structure. Newly designed pixel consists of photo diode which is verified with HSPICE simulation, PMOS reset transistor, several NMOS and several PMOS transistors. Photodiode signals from each PMOS and NMOS are detected by Reset PMOS. These output signals give enough chances to detect wide operation coverage because OFD node has overflow photocurrent. According to various light intensity, we analyzed characteristic of the output voltage with a SPICE tool. Proposed pixel output has specific value which can detect possible from 0.1 μW/㎠ to 10 W/cm2 light intensity. It has wide-dynamic range of 160 dB.
참고문헌 (10)
- E. R. Foss, "CMOS iamge sensors, electronic camera on a chip", pp.17~25 (1995), IDEM Tech. Dig.
- H. S. Wong, "CMOS image sensors-recent advantage and device scailing considerations", pp.201~204 (1997), IDEM Tech. Dig.
- B.S. Carlson, "Comparison of modern CCD and CMOS image sensor technologies and ststem for low resolution imaging", Sensors. Proceedings of IEEE, 통권 : 1, pp.171~176 (2002)
- C. Xu, "A low voltage hybrid bulk", SOI CMOS active pixel image sensor, 2001, pp.22, 248~250
- Peter Alan Levine, "Extended dynamic range image sensor system, Patent 6,040,570", ~ (2000)
- Chen Xu, "A 1.0-V VDD CMOS active-pixel sensor with complementary pixel architecture and pulsewidth modulation fabricated with a 0.25-m CMOS process", IEEE, and Mansun Chan, Senior Member, IEEEI EEE Journal of Solid - State Circuits, 37(12) (2002)
- B. Ackland, "Camera on a chip", Solid-State Circuit Conference, 1996, pp.8~10 (1996)
- Silvano Dontani, "Photodetectors: devices, circuit, and applications" (2000), Prentice Hall PTR
- 김진수, "상보형 신호경로 방식의 CMOS 이미지센서 픽셀 모델링 및 HSPICE 해석", 센서학회지, 17(1), pp.41~52 (2008), 한국센서학회
- 조용수, "SOI 핸들 웨이퍼에 고정된 광다이오드를 가진 SOI CMOS 이미지 센서", 센서학회지, 15(5), pp.341~346 (2006), 한국센서학회