【摘要】 通过对直接数字合成技术DDS工作原理的分析,结合具体的DDS芯片AD9850,详细介绍了包括FM,FSK,PSK等多种数字调制方法的实现。结果表明,数字调制具有分辨率高、全数字化可编程、相位噪声低等特点。利用多路选择器连接调制信号和载波信号,可以实现多种调制信号的仟意切换。更多还原

【Abstract】 Through analysis on the working principle of direct digital synthesis (DDS) technique,combined with actual DDS chip AD9850,detailed introduction to including FM,FSK,PSK etc multi-digital modulation methods’ realization was made.The results show that digital modulation is with high resolution,total digitalization programmable,and low phase noise etc.By using multi-route selector to connect modulation signal and carrier wave signal,random switching of multi-modulation signals can be realized.更多还原