一种DDS/PLL混合型高分辨率频率合成器  

A DDS/PLL Mixed High Resolution Frequency Synthesizer

作　　者：王建新[1] 刘国岁[1] 朱伟强 

机构地区：[1]南京理工大学电光学院,南京210094 [2]航天部8511所,南京210016

出　　处：《电子测量与仪器学报》1999年第4期72-75,共4页Journal of Electronic Measurement and Instrumentation

摘　　要：本文利用直接数字频率合成器频率分辨率高和相位噪声低而锁相环频率合成器输出频率高和对鉴相输入呈现窄带特性的优点，用ＳＴＥＬ一１１７５ＤＤＳ芯片设计了一个高分辨率正弦信号产生器，并以此推动锁相环进行倍频。通过这种 ＤＤＳ／ＰＬＬ混合型频率合成器，得到了中心频率为 ３８ＭＨｚ的高分辨率正弦信号。本文给出了电路设计过程及测试结果。By use of the high frequency resolution and low phase noise of DDS and the high output frequency and narrow band characteristic of PLL, this paper designs a high resolution sinusoidal signal producer with STEL - 1175 DDS chip, and the output signal of the DDS is used to drive the PLL frequency multiplier. A high resolution sinusoidal signal with the central frequency being 38MHz is obtained by the DDS/PLL mixed frequency synthesizer. The process of the circuit and the testing results are given.

关 键 词：锁相环 频率合成器 DDFS 混合型 正弦信号 

分 类 号：TN911.6[电子电信—通信与信息系统]