X波段频率综合器+文献综述+PCB电路图
毕业论文关键词 频率源 X波段 DDS PLL
毕业设计说明书外文摘要
Title X-band Frequency Synthesizer
Abstract
The frequency synthesizer designed in this paper is based on a practical engineering project that making a W-band RCS test equipment of the typical armored targets in outdoor. Feasible plans are discussed to realize W-band frequency synthesizer to determine implementation mode of X-band Frequency Synthesizer. Indexes of system modules are calculated. To achieve two signal sources, AD9958 with two synchronized DDS channels is selected to drive PLL (ADF4106) directly.
100MHz OCXO of the JK0C36 series whose phase noise is -150dBc/Hz@10kHz is used to achieve good phase noise of the system. The 100 MHz signal is doubled by the five frequency multiplier RMK-5-吹冰+ and used as reference clock source of DDS.
DDS is controlled by ATmega128 to output the step frequency signal that working range is from 76 to 81MHz.Then the signal is transferred to the phase-locked loop consisted by ADF4106 and HMC508 to output X-band signal. The design of the principle and PCB diagram is discussed in details. The practical design is made to output the step frequency signal that working range is from 7.6 to 8.1GHz.
Keywords Synthesizer X-band DDS PLL
目 次
1 引言 1
1.1 研究背景 1
1.2 研究现状 2
1.3 论文主要研究工作 3
2 频率源方案设计 4
2.1 系统指标分析 4
2.2 DDS模块介绍 6
2.3 锁相环模块介绍 7
2.4 具体方案选择 12
2.5 本章小结 17
3 硬件电路设计 18
3.1 晶振五倍频链路设计 18
3.2 基于AD9958的DDS链路设计 20
3.3 基于ADF4106的锁相环链路设计 24
3.4 电源模块设计 32
3.5 AD9958和ADF4106的软件配置 34
3.6 本章小结 39
4 系统制作及调试 40
4.1 PCB板图绘制 40
4.2 系统调试 41
4.3 本章小结 44
结论 43
致谢 44
参考文献45
1 引言
1.1 研究背景
在现代战争中，雷达需要拥有隐身和反隐身特性才可以在不被对方侦查到的前提下搜索发现目标，在对抗中具有优势，而雷达的隐身以及反隐身技术研究的一项重点便是武器装备散射特性的测试系统的研发[1]。本课题是毫米波散射计系统的分解课题，该散射计便是用于在外场条件下测量某武器装备的散射特性。