【摘要】 为满足自适应光学系统波前传感器需要高帧频、高灵敏度的要求,针对E2V公司的高帧频、低照度EMCCD芯片CCD60设计了外围驱动电路。系统采用FPGA作为主要的逻辑控制和时序信号发生器件,采用EL7156管脚驱动器将TTL电平转换为CCD60需要的驱动电平,并用DDS(直接数字合成器)产生正弦波通过高压放大模块来产生高压增益信号,实现电子增益控制。所设计的高压放大驱动信号可以通过软件实时调整电压幅度,能很好地控制增益电压,产生电子增益。该驱动电路已成功应用在CCD60高帧频,低照度成像系统中。更多还原

【Abstract】 In order to meets the high frame rate and high sensitivity needs of wavefront sensor in adaptive optics systems,an external driving circuit for E2V’s high frame rate and low-light EMCCD chip CCD60 was designed.This system used FPGA to generate the primary control logics and all of timing signals,and used pin driver EL7156 to generate the special driving signals of CCD60 from FPGA’s TTL logical signals.High voltage sine driving signal was used to drive high-voltage gain gate,which was generated by Direct Digital Synthesizer(DDS) and amplified by a novel high-voltage amplifier module.The range of designed high voltage sine driving signal can be real-timely adjusted and worked very well when generating electron gain.The design of the driving circuit has been successfully applied in CCD60 high frame rate and low-light imaging system.更多还原