A Miniature Low Phase Noise S-Band Direct Frequency Synthesizer
Chai Wen-qian · Radar Science and Technology · 2005
With the development of radar technology,the frequency synthesizer must have not only low phase noise,high spurious rejection and fast frequency agility,but also smaller size and lighter weight.This paper introduces a manner of designing the high performance direct frequency synthesizer in S-band which has low phase noise,low spurious,smaller size and faster frequency agility.Its experimental results and(performance) are given finally:the phase noise is below-120dBc/Hz at 645Hz,the spurious output is below-70dBc, the switching speed is faster than 2μs.These meet the requirement of modern radar system.