CO气体激光检测仪中基于FPGA的信号源设计

Design of Signal Generator Based on FPGA in CO Gas Detection Instrument of Laser

在激光检测仪的系统设计中,要求信号源四路波形同步异频发生,且有移相、倍频、波形叠加等要求。利用FPGA技术完成满足以上要求的直接数字频率合成器(DDS)的设计。在实现中选用Altera公司的FPGA芯片EP2C8Q208C8为主芯片进行设计,充分利用了该芯片的超大集成性和快速性。在改进的DDS算法结构的基础上,系统的复杂度降低,更趋于模块化,产生的波形频率更准确。

In the design of CO gas detection instrument of laser,The signal generator should be able to output four serials signals with different frequency at the same time.Besides,their digital frequency,phrase and magnitude should be flexibly adjustable.According to this,the design of DDS is discussed based on FPGA.The EP2C8Q208C8 of Altera corporation is chosen to do the main digital processing work which mainly depends on its large scale and high speed.Based on the improved DDS algorithm,the complexity of the system has been reduced,tending to be more modular,which results in more accurate frequency of the waveform.