According to the characteristics of the weak UV communication signals in free space near surface layer,the specific weak signal amplifier is designed.Based on the specifications of amplifiers,the composition and working principle of the amplifier are analyzed.Integrated operational amplifier LMH6624MF and voltage control amplifier VCA610P are adopted to design preamplifier and post-amplifier respectively.AD9214 is adopted to be as AD converter,and FPGA XC6VCX240T-2FF784 is adopted to design the frequency selective digital filter.The design and simulation are carried out by Multisim,Matlab and ISE.The results show that:the amplifier has continuously adjustable gain magnification between 1~10000 at the center frequency of 30 kHz and 50 kHz,and the bandwidth near center frequency is about 4 kHz,the equivalent input noise voltage is ≤5 nV/Hz@30 kHz,50 kHz,which satisfies specifications of the amplifier.The design using FPGA to filter has advantages of high accuracy,real-time,easy to upgrade.
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李军雨,吴晗平,吕照顺,梁宝雯,李旭辉.基于FPGA的紫外通信微弱信号放大器设计[J].激光与红外,2014,44(10):1143~1148 LI Jun-yu, WU Han-ping, Lü Zhao-shun, LIANG Bao-wen, LI Xu-hui. Design on weak signal amplifier of UV communication based on FPGA[J]. LASER & INFRARED,2014,44(10):1143~1148