摘要
针对无线广播系统对高精度的同步频率信号的需求,设计一种基于AD9548芯片的锁定GPS秒脉冲的频率源系统。分析了AD9548锁相频率合成器的基本原理以及工作特性,采用FPGA+AD9548芯片的硬件平台,通过GPS模块锁定高精度的GPS秒脉冲,实现高性能的输出频率可调的同步数字锁相频率源的设计。实验测试表明,该系统产生的频率满足同步广播系统对频率源的设计要求。
Aiming at the demand of the high frequency synchronization signal in wireless broadcasting system,a frequency source system of locking GPS second pulse based on AD9548 chip is designed. The basic principle and working characteristics of the AD9548 PLL frequency synthesizer are analyzed. By using the hardware platform of the FPGA+AD9548 chip,the GPS module is used to lock the GPS second pulse with high accuracy. The output frequency can be adjusted by the synchronous digital phase locked frequency source the design of. Experimental results show that the frequency generated by this system meets the design requirement of frequency source in synchronous broadcasting system.
出处
《电子设计工程》
2017年第23期117-120,共4页
Electronic Design Engineering
