基于CCD47-20和CCD55-30探测器设计了一种4路探测器成像电路。由于积分时间长, 该系统可以在弱光条件下实现高灵敏度成像。建立了探测器的驱动电路模型, 分析了CCD探测器对驱动的要求, 以选择合 适的驱动芯片; 在分析探测器噪声特性的基础上, 通过相关双采样法和合理的滤波器设置抑制了电路噪声。针对4路 探测器信号处理电路之间的串扰问题进行了分析和对比, 为合理的PCB布局布线提供了参考。该成像电路与商用 镜头搭配使用后已成功获取了微光条件下的低噪声外景图像。

A 4-channel detector imaging circuit based on a CCD47-20 and a CCD55-30 is designed. Because of long integration time, the system can implement high sensitivity imaging under the low-light condition. To choose appropriate driving devices, the driving circuit model for the detector is established and the driving requirements of CCD detectors are analyzed. After the noise characteristics of the detectors are analyzed, the circuit noise is suppressed by using the Correlated Double Sampling (CDS) and a reasonable filter. The noise interference among the 4 channel signal processing circuits is compared. The result is helpful to the reasonable PCB routing. This imaging circuit is used with a commercial camera lens and low noise images are obtained successfully under the low-light condition.