Realization of Digital Modulation Based on Direct Digital Frequency Synthesis
Canyan Zhu · Jiangsu Electrical Apparatus · 2006
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.