在對直接頻率合成、鎖相環(huán)頻率合成和直接數(shù)字頻率合成三種基本頻率合成技術(shù)，以及目前常用跳頻頻率合成器技術(shù)方案進(jìn)行簡要分析和對比的基礎(chǔ)上，提出了一種由直接數(shù)字頻率合成和倍頻鏈構(gòu)成的適用于超高速跳頻的頻率合成器設(shè)計(jì)方案，較好地解決了在保證頻率高速切換條件下達(dá)到超高速跳頻頻率合成器輸出頻譜純度要求的技術(shù)難點(diǎn)，并給出了采用該方案的具體實(shí)驗(yàn)結(jié)果。
關(guān) 鍵 詞 頻率合成器; 直接頻率合成; 鎖相環(huán); 直接數(shù)字頻率合成; 雜散抑制

Abstract Base on the discussion of three kinds of basic technique of frequency synthesis such as direct frequency synthesis、phase-locked loop and direct digital synthesis, and several implementation technique of frequency synthesizer, a design of frequency synthesizer combining direct digital synthesis with a chain of frequency multiplier is given. This type of frequency synthesizer is especially suitable for ultra-high-speed frequency-hop system., and find a solution that the output frequency spectrum purity of frequency synthesizer is guaranteed on the condition of ultra high speed frequency hopping. Some experimental results are also presented in the end.
Key words frequency synthesizer; direct frequency synthesis; phase-locked loop; direct digital synthesis; spurious suppression