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Experimental Research of Frequency-Locked Loop for Modern Frequency Synthesizer
Author(s): MA Jun, FANG Li-jun
Pages: 373-
376
Year: 2006
Issue:
6
Journal: RADAR SCIENCE AND TECHNOLOGY
Keyword: 频率合成; 锁频环; 相位噪声; 压控振荡器;
Abstract: 压控振荡器(VCO)是合成器中的关键器件之一,其噪声特性直接影响合成器的相位噪声和环路动态特性.在锁相合成器中,特别是宽带合成器中,对VCO采用附加锁频环进行稳频控制,明显地优化了合成器载频中远区的相位噪声,锁频环已成为先进合成器的关键技术.该文描述了锁频环(FLL)的原理,对锁频环的环路特性和相位噪声进行了理论分析,并以C波段合成器为例,给出了常规小数锁相环和小数锁相附加锁频环的实验研究结果.实验证明锁频环对优化合成器中远区相位噪声效果明显.
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