Simulation and Analysis of Photo-charge Transfer Characteristics ofBipolar Junction Photogate Transistor for CMOS Imagers

The principle of the two carriers contributing to carry the pixel signal charges is firstly presented,and then the bipolar junction photogate transistor(BJPT)with high performance is proposed for the CMOS image sensor.The numerical analytical model of the photo-charge transfer for the bipolar junction photogate is established in detail. Some numerical simulations are obtained under 0.6 μm CMOS process,which show that its readout rate increases exponentially with the increase of the photo-charge at applied voltage.

基于APS的微型星跟踪器

JPL实验室已经就如何设计未来小型化星跟踪器的问题安排了一个研究课题。该研究项目推荐发展以APS为核心的超低功耗(70mW)、超轻质量(42g)的高速(50Hz)微型星跟踪器(MAST)。当数据更新率为50Hz时,这种MAST的精度约为7.5"。对于所有轻质量与低功耗的微型卫星来说,MAST都是不可缺少的,因为在这些卫星上,质量与功耗参数是人们特别关心的。MAST仅由两个芯片组成一一个是为星跟踪器应用而优化的CMOS有源像元敏感器(APS)图像探测器,这是一项技术突破;另一个是包含内部集成电路(I^2C)接口、存储器和一个8051微控制器的专用集成电路(ASIC)芯片。MAST的强大功能使它可从几个小窗口同时输出像元数据,而由星上计算机执行处理任务。