采用帧转移型面阵CCD FT18作为传感器件,设计了一种高帧频大面阵CCD驱动电路。这种高速驱动电路能够保证在跟踪视频不变的情况下增加成像系统的视场角,满足了大视场搜索目标的要求。在介绍面阵CCD FT18的结构和特点的基础上,完成了FT18的时序电路和功率驱动电路的设计,并采用相关双采样(CDS)技术滤除了视频信号中的相关噪声,提高了系统的信噪比。对系统进行了辐射定标,定标实验数据表明,当CCD积分时间为0.32 ms时,CCD响应度为线性,验证了驱动电路工作正常。整个系统采用现场可编程门阵列(FPGA)作为核心控制器件,完成自上而下的模块化设计,实现了硬件设计的软件化,提高了开发效率。

A kind of large area CCD driving circuit with high frame frequency is designed by using a frame transfer area CCD FT18 as its sensor.This kind of high speed driving circuit can increase the angle of visual field under constant video condition in trail to meet the requirement for the big visual field of searching target.The structure and specification of the area CCD FT18 sensor are introduced,and the circuits of working clock and power driver for the sensor are proposed.The noises of the video signal (KTC noise and 1/f noise) are filtered by using the Correlated Double Sampling (CDS) technique to enhance the signal-to-noise ratio of the system.Finally a radiation scale is carried out,experiment results show that the respond degree of CCD is linear under the integration time of 0.32 ms,which verifies that the driving circuit works normally.A Field Programmable Gate Array (FPGA) is adopted as the key controller of the system to perform the modularization design from top to bottom.which realizes the hardware design by a software and improves development efficiency.