Design of PLL Frequency Synthesizer Based on DDS
Shi Songsheng · Modern Electronics Technique · 2007
In this paper,a frequency synthesizer based on DDS is discussed.The DDS mixed with the VCO output in the PLL feedback path and take the place of low-frequency loop of the multi-PLL,frequency range of the synthesizer is 89.6~110.4 MHz,resolution is 1 Hz and keep the spur of DDS.The synthesizer used the fast frequency switch ability of DDS and the loop trace ability of PLL to realize fast jump of signal.Main technical specification and key circuit are discussed.Finally,test results are given.