高帧频低拖尾帧转移CCD驱动技术

帧转移CCD在先进高光谱遥感技术中具有非常重要的应用价值,而拖尾问题是其在高光谱成像等高帧频应用中存在的最大障碍之一。为了减小拖尾的影响,建立了驱动器、PCB传输线及CCD内部结构一体化的驱动信号传输模型,比传统模型能更准确地预测CCD内部和外部的驱动信号波形;仿真对比了各种典型参数对CCD驱动信号波形的影响,仿真与实测结果具有很好的一致性。根据仿真结果进行了高帧频帧转移CCD驱动电路的优化设计,实现了100 ns的行转移时间,在500 fps的帧频下获得了拖尾系数小于1%的驱动效果,为进一步提高CCD的工作帧频提供了保障。

Driving techniques for high-frame-rate frame transfer CCDs with low smear

Frame transfer CCDs play a very important role in hyperspectral remote sensing, while smear has become one of the greatest obstacles for frame transfer CCDs used in hyperspectral imaging and other applications with high frame rate. In order to reduce the smear effect, a clock propagation model consisting of the driver, transmission line and the internal structure of the CCD were established, which better predict the clock waveforms inside and outside of the CCD. The effect on the clock waveforms with typical values of the parameters was simulated, and the simulation and measured results shown great consistency. The driving electronics was optimized based on the simulation, resulting in a line transfer time of as short as 100 ns, which is equal to a smear factor of within 1% under a frame rate of 500 fps, showing the ability of frame transfer CCDs to operate at higher frame rates.