基于环内混频宽带细步进频综的设计与实现  

A Wide Bandwidth Frequency Synthesizer with mixing within RF feedback path

作　　者：刘武广[1] 陈昌锐[1] 张文峰[1] 

机构地区：[1]中国西南电子设备研究所,四川成都610036

出　　处：《信息通信》2014年第5期64-66,共3页Information & Communications

摘　　要：基于DDS+PPL环内混频结构,设计了一款频率覆盖范围为4698MHz^8278MHz的宽带频率合成器,实现了1Hz的频率步进,≤-100dBc/Hz@1KHz的相噪;通过引入1:1锁相改善了DDS的输出杂散,实现了全频段65dBc的杂散抑制。论证了综合运用DDS和环内混频技术可提高频率合成器的综合性能,具有良好的应用前景。This article designs a wideband frequency synthesizer which covers from 4698MHz to 8278MHz, based on both DDS and frequency mixing technology within RF feedback path. The channel spacing is 1Hz and the phase noise at 1KHz is less than-100dBc/Hz. By introducing a novel 1：1 PLL dealing with DDS, the frequency synthesizer can achieve low spur level： 65dBc.It is shown that combining DDS with frequency mixing technology can improve the performance of frequency synthesizer and will be more popular in the future.

关 键 词：锁相环 环内混频 细步进 低相噪 低杂散 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]