一种低带内相位噪声的立体声FM合成器  

A Low in-band Phase Noise Frequency Synthesizer for FM Stereo Transmitter

作　　者：曹政新[1] 李学初[1] 李振[1] 吴岳[1] 宋树贵[1] 熊绍珍[1] 

机构地区：[1]南开大学光电子所,天津300071

出　　处：《固体电子学研究与进展》2007年第3期386-390,共5页Research & Progress of SSE

基　　金：天津市科委科技攻关计划培育项目(06YFGPGX08300);国家自然科学基金项目(60437030)

摘　　要：研制一种低带内相位噪声的立体声FM频率合成器,该合成器基于小数分频锁相环技术,利用闭环方式对载波信号进行调制,显著提高系统的THD。采用CSMC0.5μm DPTM CMOS工艺对其设计,系统测试结果表明,立体声解调后SNR>70dB,THD<0.08,立体声分离度>40dB,最大带外辐射能量低于-90dBc/Hz。以上这些特性完全符合立体声发射机的要求。A low in-band phase noise FM frequency synthesizer has been depicted in this paper. It bases on the fraction N PLL frequency synthesizer, and the THD of the system has been improved greatly by this closed loop modulation mode. The synthesizer has been designed with CSMC 0.5 μm DPTM CMOS technology and system experiments show that it has achieved THD d0.08%, SNR〉70 dB, stereo separation〉40 dB, and the maximum out-band emission energy 〈-90 dBc/Hz. All these merits are very suit for FM transmitter.

关 键 词：调频 小数分频锁相环 带内相位噪声 

分 类 号：TN722[电子电信—电路与系统]