摘要
设计了一种以NiosII为控制核心的波特率和载频均可变的2FSK调制器IP核,给出了软硬件设计方案。利用直接数字频率合成器(DDS)来合成调制器的调制频率,通过修改DDS的频率控制字,控制调制频率变化;通过修改可编程分频器的分频因子,控制波特率的变化。利用嵌入式逻辑分析仪验证结果表明,本系统工作稳定,波特率和调制频率均可通过软件进行精确设置。
The IP core of a 2FSK digital modulator with variable baud rate and carrier frequency is designed with Nios Ⅱ as control core, and the hardward and softward realization are provided. Direct Digital Frequency Synthesizer（DDS） is used to synthesize the carrier frequence, and the cartier frequence is adjusted by modifying frequency control word of DDS. The baud rate of digital modulator is also adjusted by modifying divider factor of programmable divider. Test with SigalTap II Logic Analyzer shows that the modulator runs stably and both the baud rate and carrier frequency can be set accurately by program.
出处
《电讯技术》
北大核心
2010年第5期64-67,共4页
Telecommunication Engineering
基金
广西壮族自治区教育厅科研项目(200911LX474)~~
