CAJ | 학술논문

针对近地层自由空间紫外通信信号微弱的特点，设计具体的微弱信号放大器。在提出放大器指标基础上，分析了放大器的组成与工作原理。运用LMH6624MF型号的集成运算放大器和VCA610P型号的电压控制放大器分别设计了前置放大器和后级放大器，采用AD9214作为AD转换，选用XC6VCX240T-2FF784型号的FPGA设计了选频数字滤波器。用Multi-sim、Matlab、ISE进行设计仿真验证，结果表明：该放大器在30 kHz 和50 kHz 两个中心频率具有1～10000之间连续可调的放大倍数，中心频率附近带宽约为4 kHz，等效输入噪声电压≤5 nV/ Hz ＠30 kHz，50 kHz，符合设计技术要求。设计中采用FPGA 实现滤波，具有精度高、实时性好、便于升级等优点。
침대근지층자유공간자외통신신호미약적특점，설계구체적미약신호방대기。재제출방대기지표기출상，분석료방대기적조성여공작원리。운용LMH6624MF형호적집성운산방대기화VCA610P형호적전압공제방대기분별설계료전치방대기화후급방대기，채용AD9214작위AD전환，선용XC6VCX240T-2FF784형호적FPGA설계료선빈수자려파기。용Multi-sim、Matlab、ISE진행설계방진험증，결과표명：해방대기재30 kHz 화50 kHz 량개중심빈솔구유1～10000지간련속가조적방대배수，중심빈솔부근대관약위4 kHz，등효수입조성전압≤5 nV/ Hz ＠30 kHz，50 kHz，부합설계기술요구。설계중채용FPGA 실현려파，구유정도고、실시성호、편우승급등우점。
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 princi-ple of the amplifier are analyzed.Integrated operational amplifier LMH6624MF and voltage control amplifier VCA61 0P are adopted to design preamplifier and post-amplifier respectively.AD921 4 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 be-tween 1 ~1 0000 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.