基于AD9910的70MHz中频信号源设计
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摘要
一个频率高度稳定的频率合成器在空间通信、卫星导航等电子系统中具有重要作用。文章立足于实际需求,以AD9910为频率合成器件,应用DDS技术,设计了一款覆盖70MHz±20MHz频率范围的中频信号源。该信号源应用MSP430F149单片机作为控制核心,控制AD9910输出所需频率;应用可调衰减器控制发射功率,使其动态调节范围在-20dBm～10dBm之间,从而满足多数应用的功率使用需求;并加入放大和滤波环节,以实现谐波和杂散分量的调整或抑制。最后,通过ADS仿真、矢量网络分析仪和频谱分析仪测试,表明该中频信号源基本满足设计指标,且该思路为高性能数字调频信号源的设计提供了实现方法,具有较高的实用价值。
A Frequency signal source,with highly stable frequency,plays an important role in space communication,satellite navigation and other electronic systems. Based on the actual demand,an intermediate frequency signal source,which can cover the frequency range of 70 MHz ± 20 MHz,is designed through the technology of DDS,and it uses AD9910 as frequency synthesis device. As the core of the controlling,MSP430F149 controls AD9910 to output the required frequency. Then the adjustable attenuator controls the transmission power to makes the dynamic range of the transmission power between-20 dBm ～ 10 dBm. This range of power regulation meets the needs of most applications. Additionally,amplification device and filtering device are added,for realizing the adjustment or suppression of harmonic and stray components. Finally,by way of ADS simulation,vector network analyzer test and spectrum analyzer test,we know that the signal source basically meets the design criteria. The design idea of this signal source provides a method for the design of high performance digital frequency modulation signal source,which has high practical value in application.
A Frequency signal source,with highly stable frequency,plays an important role in space communication,satellite navigation and other electronic systems. Based on the actual demand,an intermediate frequency signal source,which can cover the frequency range of 70 MHz ± 20 MHz,is designed through the technology of DDS,and it uses AD9910 as frequency synthesis device. As the core of the controlling,MSP430F149 controls AD9910 to output the required frequency. Then the adjustable attenuator controls the transmission power to makes the dynamic range of the transmission power between-20 dBm ～ 10 dBm. This range of power regulation meets the needs of most applications. Additionally,amplification device and filtering device are added,for realizing the adjustment or suppression of harmonic and stray components. Finally,by way of ADS simulation,vector network analyzer test and spectrum analyzer test,we know that the signal source basically meets the design criteria. The design idea of this signal source provides a method for the design of high performance digital frequency modulation signal source,which has high practical value in application.
引文
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[3]杨立明,吉欣,秦玉峰.一种基于PROM寻址的星载高可靠遥控译码器设计方法[J].空间电子技术,2016,(3):68-71.
[4]谢军,刘庆军,边朗.基于北斗系统的国家综合定位导航授时(PNT)体系发展设想[J].空间电子技术,2017,(5):1-6.
[5]夏江林,邹传云.基于ADF4350的锁相环频率合成器设计与实现[J].通信技术,2018,(3):734-740.
[6]黄鸯鸯,王保良,冀海峰.基于Lamb波气体传感器的数据采集仪[J].北京航空航天大学学报,2017,43(11):2216-2223.
[7]鞠宗良.直接数字频率合成技术及其应用[J].宁夏石油化工,2001,(增刊):10~12.
[8]刘颖.军民两用的微波中频信号源的设计[J].自动化与仪器仪表,2017(5):79-81.
[9]TI.SGA-2486[M].303 Technology Court,Broomfield,CO 80021.
[10]赵同刚,曹贝贝.增益控制射频放大器的设计与实现[J].实验科学与技术,2017,15(4):7-10.