基于FPGA的模式可调线阵CCD驱动电路设计

Design of Mode-adjustable CCD Drive Circuit Based on FPGA

光谱仪的微型化是光谱仪的发展趋势,其中具有高灵敏度、高信噪比、光谱响应宽、体积小特性的线阵CCD用作光电探测器成为研究热点。针对传统对CCD驱动电路遇到参数修改情况而需要改变硬件电路或重复烧写程序的缺点,以线阵CCD-ILX554B配合CCD专用信号处理芯片AD9826为例,结合FPGA控制芯片搭建了一个CCD驱动与信号采集系统。通过研究CCD与AD9826内部结构并分析控制驱动时序,结合Verilog HDL语言,设计了CCD工作模式、积分时间及工作频率软件可调整的CCD驱动系统,硬件电路设计考虑EMC并设计针对CCD输出信号的处理电路与数据传输模块。实验结果表明,该设计成功地驱动了线阵CCD并实现了模式可调,进行数据传输,且电路体积小、控制时序精确,可用作微型光谱仪的光电探测电路。

With the miniaturization of the spectrometer becoming a current trend,the using of linear array Charge-Coupled-Device(CCD)as a photo-detector has been a hot area of research for several years due to its high sensitivity,high signal-noise ratio,wide spectral-response and small volume.Considering the defect of the traditional CCD drive circuit which repeatedly changes the hardware circuit or downloads programming when encountered with parameters changing in the timing design,taking the linear array CCD-ILX554B of Sony as an example,the CCD signal processing chip AD9826 was used as an example,and a CCD driver and signal acquisition system was built by combining FPGA control chip..By studying the internal structure of CCD,AD9826 and analyzing the control timing,Verilog HDL language was taken advantage to design the CCD operating mode and the CCD driving program with integral time and CCD drive system with adjustable working frequency.For the hardware circuit,EMC is taken into account and the processing circuit together with the signal transmission module are designed aiming at the CCD output signal.The experiment results show that the proposed design can successfully drive the linear array CCD and realize the mode-adjustable data transmission.Moreover,the circuit is compact and the timing control is accurate,which is qualified to be used as micro-spectrometer photoelectric detection circuit.