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采用直接数字频率合成器混频信号的高频功率源设计
引用本文:李冬,高敏,胡桐宁,杨军,秦斌.采用直接数字频率合成器混频信号的高频功率源设计[J].强激光与粒子束,2008,20(10).
作者姓名:李冬  高敏  胡桐宁  杨军  秦斌
作者单位:1. 华中科技大学 电气与电子工程学院, 武汉 430074; 2. 武汉理工大学 自动化学院, 武汉 430070; 3. 华中科技大学 电子与信息工程系, 武汉 430074
基金项目:国家自然科学基金重点项目10435030
摘    要: 提取直接数字频率合成器芯片AD9850输出的混频信号作为系统的频率源,介绍了高频功率源的结构和原理。系统的工作频率范围为(96±1) MHz,最大输出功率为10 kW。驱动级采用MOSFET晶体管功率放大模块,末级采用高频真空四极管4CW10000B。四极管采用阴地电路,工作在甲乙类。高频功率源采用压控可变衰减器进行幅度调制,为满足系统的频率和幅值稳定度要求,功率源采用带温度补偿的晶体振荡器,并让四极管工作在过压状态。在应用Ziegler-Nichols法整定控制器的PID参数时,为实现控制系统的在线自整定,系统采用了继电反馈法,由极限周期和增益得出PID参数。

关 键 词:直接数字频率合成器  四极管  压控可变衰减器  PID参数  继电反馈法
收稿时间:1900-01-01;

Design of RF amplifier based on DDS output
LI Dong,GAO Min,HU Tong-ning,YANG Jun,QIN Bin.Design of RF amplifier based on DDS output[J].High Power Laser and Particle Beams,2008,20(10).
Authors:LI Dong  GAO Min  HU Tong-ning  YANG Jun  QIN Bin
Institution:1. College of Electronic and Electric Engineering, Huazhong University of Science andTechnology, Wuhan 430074, China; 2. College of Automation, Wuhan University of Technology, Wuhan 430070, China; 3. Department of Electronics and Information Engineering, Huazhong University of Science andTechnology, Wuhan 430074, China
Abstract:As a new RF generator, the direct digital synthesizer(DDS) has been widely used. In order to reduce the high cost of the signal generator comprising a high performance DDS device, the method of picking-up a desired aliased signal DDS output is adopted in the design. A device of AD9850 is used to generate RF signal in the system, and the amplitude modulation of the system is achieved by using a voltage variable attenuator.The amplifier based on tetrode is selected to get an output power of 10kW at (96±1) MHz. Amplifier operates in a grounded cathode configuration. A short-circuited coaxial transmission line is adopted in both input circuit and output circuit. The PID-control strategy has been used in control system ,and the relay method has been used for measurement. The controller has a b
Keywords:Tetrode  Voltage variable attenuator  PID  Relay method
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