摘要
设计了一种由单片机PIC18LF4520控制DDS芯片AD9911的频率源电路.阐述了单片机控制DDS的软硬件实现方法,以及AD9911内部寄存器的配置要点.系统设计外围电路简单,可方便地实现对频率源电路输出频率、相位和工作模式的控制,输出信号频率范围为25～75 MHz.实验结果表明,该频率源具有输出频率精确、频率分辨率高和相位噪声低等特点,符合通信系统对频率源的设计要求.
A program controlled frequency source based on MCU PIC18LF4520 and DDS AD9911 is designed and implemented. The frequency range is between 25 MHz to 75MHz. The system hardware and software design is elaborated, and the configuration of registers in AD9911 is introduced. The system design has simple peripheral circuitry and can conveniently control the output frequency, phase and working modes of AD9911. The experimental results show that the circuit can output signals with high precision, high resolution and low phase noise, meeting the design specifications of frequency synthesizers in communication systems.
出处
《电子科技》
2014年第3期66-69,共4页
Electronic Science and Technology
