高性能小数频率合成器的研究与设计  

Research and Design of High Performance Fractional-N Frequency Synthesizer

作　　者：刘亮[1] 何攀峰[1] 

机构地区：[1]电子测试技术国防科技重点实验室,山东青岛266555

出　　处：《中国电子科学研究院学报》2008年第2期190-194,共5页Journal of China Academy of Electronics and Information Technology

摘　　要：小数频率合成技术是实现高分辨率低噪声频率合成器的重要技术手段之一。在分析研究小数频率合成的基本原理及其杂散抑制技术方法上，基于通用灵活的设计思想，采用FPGA集成技术设计了一种基于∑-△调制技术的高性能小数分频器，利用该分频器实现的频率合成器，频率范围800—1200MHz，频率分辨率达到nHz量级，偏离主频10kHz处单边带相位噪声优于-105dBc／Hz，应用于某高纯微波合成信号发生器中，获得了令人满意的效果。The fractional-N frequency synthesis is one of the most important techniques to realizing the frequency synthesizer with fine frequency resolution and low phase noise. After analyzing and researching the basic theory of fractional-N synthesis and the methods to suppress the fractional spurs, this paper designs a high performance fractional-N divider based on sigma-delta modulation technique with FPGA which is flexible and good for general purpose. A fractional-N synthesizer is realized using this divider. Its working frequency is between 800 MHz and 1200 MHz. The frequency resolution is 17.7 nHz and SSB phase noise is less than -105 dBc/Hz （10 kHz offset carrier）. The synthesizer has been used in a microwave signal generator and received a satisfying result.

关 键 词：频率合成 小数分频 小数杂散 ∑-△调制 

分 类 号：TM931[电气工程—电力电子与电力传动]