摘要
讨论了数字电视调谐器本振相位噪声,在分析直接数字频率合成器(DDS)的原理及特点的基础上,提出了一种DDS与锁相环(PLL)混合电路用于调谐器本振的方法.应用该方法可使其在所用频率点上无相位截断噪声,从而使调谐器本振的相位噪声大大改善.实验证明,该方法是有效的.
This paper discussed the phase noise of a digital TV tuner local oscillator. Based on the analysis of direct digital synthesizer (DDS) theory and feature ,it presented a method to design the tuner local oscillator using DDS hybrid PLL(phase lock loop) circuit. According to this method all the DDS output frequencies have no phase truncation noise, so the phase noise of the tuner local oscillator is greatly improved. This method was proved by an experiment.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2005年第9期1526-1529,共4页
Journal of Shanghai Jiaotong University
关键词
直接数字频率合成器
锁相环路
电视调谐器
相位噪声
本地振荡器
direct digital synthesizer (DDS)
phase lock loop (PLL)
television tuner
phase noise
local oscillator