一种新型大动态范围CMOS图像传感器

提出了一种具有新型像素结构的大动态范围CMOS图像传感器,通过调整单个像素的积分时间来自适应不同的局部光照情况,从而有效提高动态范围。设计了一种低延时、低功耗、结构简单的新型pixel级电压比较器及基于可逆计数器的时间-电压编码电路。采用0.6μm DPDM标准数字CMOS工艺参数对大动态范围像素单元电路进行仿真,积分电容电压Vcint与光电流呈良好的线性关系,其动态范围可达126dB。在3.3V供电电压下,单个像元功耗为2.1μW。

Novel CMOS Image Sensor with high dynamic range

A high dynamic range CMOS image sensor with novel pixel architecture is presented,which adjusts the single pixel integration time to adapt to different local light conditions.So the dynamic range is effectively enhanced.A novel pixel-level voltage comparator with low-latency,low power consumption,simple structure and a time-voltage encoding circuit are designed based on reversible counter.The high dynamic range unit pixel circuit is simulated based on 0.6 μm DPDM standard digital CMOS process parameters.The results show that there is a good linear relationship between integral capacitor voltage Vcint and photcurrent,and the dynamic range is 126 dB and the power consumption is only 2.1 μW in the 3.3 V supply voltage.