摘要
CCD成像系统中模拟前端对系统信噪比起决定性作用。为了提高成像系统的信噪比,需要对模拟前端以及其PCB布局布线进行合理的设计。在深入分析模拟前端中各部分功能的基础上,针对目前模拟前端一般采用专用CCD视频信号处理器来实现的方案,建立了CCD视频信号处理器这个模拟数字混合器件芯片内部的电源及接地模型,并根据该模型对PCB布局布线进行了分析和设计。工程实践结果表明,在像素时钟为6 MHz时,系统的信噪比可以达到54dB。
The analog front end of a CCD imaging system is critical to the signal noise ratio of the camera. In order to increase the signal noise ratio of the imaging system,the layout and the PCB routing of the analog front end must be properly designed. Thus, based on analysis of the function of every part of the analog front end and design scheme of a specified CCD video signal processor, the power supply and grounding model of the specified CCD video signal processor with the analog and digital mixed signal device was established. And according to this model, the layout and PCB routing for the analog front end were analyzed and designed. The result shows that the signal noise ratio of the system could be up to 54 dB when the pixel clock is 6 MHz.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2007年第8期1191-1195,共5页
Optics and Precision Engineering
基金
国家重大创新资助项目(No.ZB99I14H)
关键词
CCD
成像系统
模拟前端
高速相机
低噪声
CCD
imaging system
analog front end
high-speed camera
low noisy
