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本文论述了微机控制的数字式锁相环频率合成调谐系统,分析了实现该系统所存在的关键问题及解决途径。对自动搜索时俘获灵敏度和俘获销定频率的精度之间存在的矛盾,提出了几种看法。文章还讨论了自动搜索环路专用中频放大器和窄带选择性回路的设计。
This paper discusses the computer-controlled digital phase-locked loop frequency synthesis tuning system, analyzes the key problems existing in the system and solutions. Several contradictions exist between the accuracy of capture sensitivity and capture pinning frequency in automatic search. The article also discusses the design of automatic search loop dedicated IF amplifiers and narrowband selective loops.