Design of a frequency agility synthesizer with low spurious using DDS technology
Sun Min · Information and Electronic Engineering · 2011
In order to counter active jamming,the radar system requires frequency synthesizer to have a frequency agility characteristics;and also requires the spurious suppression the higher the better,especially when the bandwidth of the output signal is wide.Limited by the size and cost,currently,the frequency agility frequency synthesizers are widely based on Direct Digital Synthesis(DDS) technology.Some research and analysis about frequency agility frequency synthesizer technology based on low spurious using DDS are involved in this thesis;simultaneously,a new DDS IC frequency agility frequency synthesizer with the DDS clock frequency up to 3.2 GHz is introduced.The bandwidth of the frequency agility frequency synthesizer is 250 MHz and its spurious suppression index is better than-65 dBc in the whole band.