具有深度二次谐波抑制的低相位噪声射频振荡器  

Low phase noise RF oscillator with high second harmonic suppression

作　　者：周文骏[1] 张雪峰[1] 陈建新[1] 

机构地区：[1]南通大学电子信息学院,江苏南通226019

出　　处：《南京理工大学学报》2015年第4期477-482,共6页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(61271136);教育部"新世纪优秀人才"支持计划(NECT-11-0993)

摘　　要：射频振荡器作为无线通信系统的关键部件,在射频前端上/下变频电路中扮演着非常重要的角色。为了满足系统对振荡器高性能的要求,该文给出了具有深度二次谐波抑制功能的低相位噪声反馈型射频振荡器的设计方法。在放大器的输入输出端之间引入微带带通滤波器构成反馈回路,利用其通带中较大的复数品质因数有效降低了振荡器的相位噪声;在振荡器输出端加载一对并联的λg/8开、短路枝节来实现在不影响基波信号的同时对二次谐波进行有效抑制。设计的射频振荡器实测和仿真结果吻合良好,低相位噪声与二次谐波抑制同时在所提出的振荡器上得到实现。As a key component in wireless communication system,the radio frequency( RF) oscillator plays a key role in the frequency up-/ down-conversion in the RF front end. In order to meet the requirements of the system improvements,this paper proposes a method to design a low phase noise feedback oscillator with the high second harmonic suppression. A bandpass filter is introduced between the input and output of the amplifier for constructing a feedback loop. The phase noise of the oscillator can be effectively improved due to its large complex quality factor( peak QSC) in the passband. Then a pair of λg/8 open-and short-circuited stubs in parallel is added to the output of the oscillator in order to effectively suppress the second harmonic while there is no effect on the fundamental signal. The measured and simulated results show good agreement. The low phase noise and second harmonic suppression are simultaneously realized in the proposed oscillator.

关 键 词：射频反馈型振荡器 低相位噪声 带通滤波器 复数品质因数 二次谐波抑制 

分 类 号：TN752.2[电子电信—电路与系统]