This paper presents a 12-bit column-parallel successive approximation register analog-to-digital con- verter （SAR ADC） for high-speed CMOS image sensors. A segmented binary-weighted switched capacitor digital- to-an...This paper presents a 12-bit column-parallel successive approximation register analog-to-digital con- verter （SAR ADC） for high-speed CMOS image sensors. A segmented binary-weighted switched capacitor digital- to-analog converter （CDAC） and a staggered structure MOM unit capacitor is used to reduce the ADC area and to make its layout fit double pixel pitches. An electrical field shielding layout method is proposed to eliminate the parasitic capacitance on the top plate of the unit capacitor. A dynamic power control technique is proposed to reduce the power consumption of a single channel during readout. An off-chip foreground digital calibration is adopted to compensate for the nonlinearity due to the mismatch of unit capacitors among the CDAC. The prototype SAR ADC is fabricated in a 0.18 μm 1P5M CIS process. A single SAR ADC occupies 20 × 2020μm2. Sampling at 833 kS/s, the measured differential nonlinearity, integral nonlinearity and effective number of bits of SAR ADC with calibration are 0.9/-1 LSB, 1/-1.1 LSB and 11.24 bits, respectively; the power consumption is only 0.26 mW under a 1.8-W supply and decreases linearly as the frame rate decreases.展开更多
The Conference on Dialogue of Asian Civilizations (CDAC) held last month in Beijing pooled the splendid achievements of civilizations from countries in Asia and beyond together. It provided a platform for those involv...The Conference on Dialogue of Asian Civilizations (CDAC) held last month in Beijing pooled the splendid achievements of civilizations from countries in Asia and beyond together. It provided a platform for those involved to draw wisdom from each other, and on the basis of that to work hand in hand with confidence and implement new ideas towards common prosperity. However, in an economically globalized world, crises faced by different civilizations also tend to be quickly globalized, represented by various political and cultural crises and terrorist activities. As to the reasons – the lack of mutual respect, the barriers, and the misunderstandings between countries take the blame.展开更多
President Xi Meets Cambodian King On May 14, Chinese President Xi Jinping met with Cambodian King Norodom Sihamoni, who was in Beijing attending the Conference on Dialogue of Asian Civilizations (CDAC). Noting how Chi...President Xi Meets Cambodian King On May 14, Chinese President Xi Jinping met with Cambodian King Norodom Sihamoni, who was in Beijing attending the Conference on Dialogue of Asian Civilizations (CDAC). Noting how China cherishes the special friendship it has with the Cambodian royal family, Xi said China will continue to support Cambodia in pursuing the development path suited to its own national conditions, and work with Cambodia to elevate their comprehensive strategic partnership of cooperation to a new level.展开更多
基金Project supported by the National Natural Science Foundation of China(No.61234003)the Special Funds for Major State Basic Research Project of China(No.2011CB932902)
文摘This paper presents a 12-bit column-parallel successive approximation register analog-to-digital con- verter （SAR ADC） for high-speed CMOS image sensors. A segmented binary-weighted switched capacitor digital- to-analog converter （CDAC） and a staggered structure MOM unit capacitor is used to reduce the ADC area and to make its layout fit double pixel pitches. An electrical field shielding layout method is proposed to eliminate the parasitic capacitance on the top plate of the unit capacitor. A dynamic power control technique is proposed to reduce the power consumption of a single channel during readout. An off-chip foreground digital calibration is adopted to compensate for the nonlinearity due to the mismatch of unit capacitors among the CDAC. The prototype SAR ADC is fabricated in a 0.18 μm 1P5M CIS process. A single SAR ADC occupies 20 × 2020μm2. Sampling at 833 kS/s, the measured differential nonlinearity, integral nonlinearity and effective number of bits of SAR ADC with calibration are 0.9/-1 LSB, 1/-1.1 LSB and 11.24 bits, respectively; the power consumption is only 0.26 mW under a 1.8-W supply and decreases linearly as the frame rate decreases.
文摘The Conference on Dialogue of Asian Civilizations (CDAC) held last month in Beijing pooled the splendid achievements of civilizations from countries in Asia and beyond together. It provided a platform for those involved to draw wisdom from each other, and on the basis of that to work hand in hand with confidence and implement new ideas towards common prosperity. However, in an economically globalized world, crises faced by different civilizations also tend to be quickly globalized, represented by various political and cultural crises and terrorist activities. As to the reasons – the lack of mutual respect, the barriers, and the misunderstandings between countries take the blame.
文摘President Xi Meets Cambodian King On May 14, Chinese President Xi Jinping met with Cambodian King Norodom Sihamoni, who was in Beijing attending the Conference on Dialogue of Asian Civilizations (CDAC). Noting how China cherishes the special friendship it has with the Cambodian royal family, Xi said China will continue to support Cambodia in pursuing the development path suited to its own national conditions, and work with Cambodia to elevate their comprehensive strategic partnership of cooperation to a new level.
