摘要
设计实现了一种以AD9959为核心的模拟调制信号源,该信号源采用CPCI+FPGA+DDS架构,可将数字采样信号调制到射频工作频率,用数字的方法实现了模拟信号的幅度调制和频率调制。该文从DDS工作原理入手,提出了基于DDS的模拟调制信号源总体框架,并着重阐述了AM和FM数字调制信号转换为DDS控制字的过程。该信号源已应用于工程实践上,实际结果表明,该信号源产生的模拟调制信号频率稳定度高、幅相一致性好、抗干扰能力强,完全满足广播通信领域的功能要求。
A kind of Analog Modulation generator based on AD9959 is designed,The generator use CPCI+FPGA+DDS architecture,the digital sample signals could be modulated into RF directly,AM and FM with digital methods is achieved.The article starting with DDS working principle,System framework of analog modulation generator Based on DDS is gived,and mainly introduces the conversion of digital modulation signals into DDS instruction words.The generator have been applied in engineering practice, and the experimental results showed that the generator had several advantages such as high frequency stability、high precise of Phase amplitude consistency、strong anti- jamming,which fully meet the function requirements in the Field of Broadcasting-Communication.
出处
《电脑知识与技术（过刊）》
2015年第10X期35-37,共3页
Computer Knowledge and Technology
