电子倍增CCD模拟前端设计与信号优化  

Design and signal optimization of analog front end of EMCCD

作　　者：张龙 何伟基 顾国华 陈钱 黄强强 

机构地区：[1]江苏省光谱成像与智能感知重点实验室,江苏南京210094

出　　处：《红外与激光工程》2014年第7期2263-2269,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(61101196);微光夜视技术重点实验室开放基金(J110508)

摘　　要：基于电子倍增CCD(EMCCD)在微光低照度条件下的实时应用,针对EMCCD对驱动信号相位、频率、幅度的严格要求,以及输出信号的特点,在深入分析模拟前端各部分功能的基础上,提出一种改善EMCCD驱动电路,优化驱动信号质量,降低模拟前端噪声水平的驱动策略,设计一款实时、低噪、稳定、适用于微光环境的EMCCD相机。工程验证表明,在环境照度为1×10-3lx,信号时钟为12.5 MHz,帧频为25帧/s的条件下,EMCCD相机具有实时快速成像能力,输出的模拟视频信号低噪稳定,成像系统捕获的图像清晰信噪比高,基本满足EMCCD成像系统在微光低照度环境下的实时应用需求。Based on the real-time applications of EMCCD imaging system in low light environments, for the characters of output signal and the strict requirements of the EMCCD drive signals on phase, frequency and amplitude, a strategy after in-depth analysis about functions of each part of the analog front-end （AFE） was proposesd to improve the the EMCCD driver circuits, optimize the drive signals quality and reduce the noise level of EMCCD AFE. A real-time, low noise, stable EMCCD camera was designed, which can work in low light level situation. Testified by projects, when the ambient illumination is 1×10-3 lx, EMCCD camera has real-time and high-speed imaging capability, when the signal clock is 12.5 MHz, the image data rate is 25 frames per second, the output signal is stable and low noise, the captured images are clear, stable, basically meets the real-time applications requirements for the EMCCD imaging system in low light environments.

关 键 词：电子倍增CCD 模拟前端 信号优化 干扰抑制 硬件电路设计 

分 类 号：TN223[电子电信—物理电子学]