摘要
提出一种基于直接频率合成技术（DDS）的锁相环（PLL）频率合成器，该合成器利用DDS输出与PLL反馈回路中的压控振荡器（VCO）输出混频，替代多环锁相频率合成器中的低频率子环，使合成器输出频率在89．6～110．4MHz之间分辨率达1Hz，并保持DDS相噪、杂散水平不变。结合DDS的快速频率切换和PLL环路跟踪能力，实现信号的快速跳频。本文给出了技术方案，讨论部分电路设计，并对主要技术指标进行理论分析，最后给出了实验结果。
In this paper,a frequency synthesizer based on DDS is discussed. The DDS mixed with the VCO output in the PLL feedback path and take the place of low - frequency loop of the multi - PLL, frequency range of the synthesizer is 89. 6-110. 4 MHz,resolution is 1 Hz and keep the spur of DDS. The synthesizer used the fast frequency switch ability of DDS and the loop trace ability of PLL to realize fast jump of signal. Main technical specification and key circuit are discussed. Finally, test results are given.
出处
《现代电子技术》
2007年第23期74-76,共3页
Modern Electronics Technique
关键词
直接数字式频率合成
锁相环
混频
带通滤波器
direct digital frequercy synthesis
PLL
mix frequency
band - pass filter
