摘要
介绍了一种星载相机电子倍增CCD(EMCCD)高压驱动电路的设计。该设计基于FPGA,采用直接数字频率合成技术实现正弦码数的发生,并能接收卫星指令信号进行在线调幅和调相;然后通过低压差分信号(LVDS)总线和高速大幅值运放技术,把正弦信号转化为EMCCD所需的高压倍增驱动信号。利用仿真与计算进行电路参数设定,并研制了实物样机。试验结果显示:电路生成的驱动信号相位调整步长为π/8,幅值调整精度优于0.01V。该设计可为国内后续EMC-CD卫星相机的研制提供参考。
A design of electron multiplying CCD（EMCCD） high-voltage driver circuit in satellite camera is introduced. Sinusoidal codes generator is implemented by a FPGA with direct digital frequency synthesis, which can receive telecommand signals to proceed amplitude and phase on- line adjustment. LVDS bus and large amplitude operational amplifier technique are utilized to convert sinusoidal signal to EMCCD high-voltage driving signal. Circuit parameters are settled by making calculations and simulations, then a physical prototype is developed. The results show that the phase modulation step of the driving signal is π/8, and the amplitude adjustment preci- sion is superior to 0.01V. This design can become an reference for the development of later EMC- CD satellite camera in China.
出处
《航天器工程》
2012年第3期48-53,共6页
Spacecraft Engineering
基金
国家重大科技专项工程
