100MHz低噪声恒温石英晶体振荡器研制  

Development of 100 MHz Low-Phase-Noise Oven Crystal Oscillator

作　　者：刘利辉[1] 曾健平[1] 张智[1] 

机构地区：[1]湖南大学物理与微电子科学学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2009年第4期53-56,共4页Journal of Hunan University:Natural Sciences

基　　金：湖南省科技计划资助项目(2008FJ3123)

摘　　要：为满足振荡器高频低噪声的要求,设计了一种100 MHz低噪声恒温石英晶体振荡器.该振荡器选用AT切型高Q值无谐波石英谐振器;主振电路采用并联型电路结构;主振管采用Rbb′小,fT高和NF小的低噪声管以达到降噪目的;主振级与输出级之间加入T型匹配网络以增大主振级输出功率;输出级采用并联谐振电路以提高频谱纯度.样品通过测试,其相位噪声为-165 dB/Hz@10 kHz.In an attempt to meet the requirements of high frequency and low-phase-noise,a 100 MHz low- phase-noise oven crystal oscillator was developed. Based on the comparison of the performances of the crystal resonator, the AT type with high Q and no harmonic wave was chosen. The parallel frame and a low-phrase-noise transistor of low Rbb, high Q and low NF were used in the main vibration circuit so as to reduce the phase noise. Meanwhile, a T-type-matching network was designed between the main vibration stage and output stage to enhance the output power. In the output stage, a parallel-type resonant circuit was also designed to improve frequency purity. The experiment results have shown that a low-phase-noise is obtained in our designed crystal resonator.

关 键 词：石英谐振器 频温特性 振荡电路 低噪声 

分 类 号：TN752.2[电子电信—电路与系统]