低相位噪声VCO的设计  

Design of the Low Phase Noise VCO

作　　者：向永波[1,2] 阎跃鹏[1] 高海飞[1] 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]空军工程大学,西安710051

出　　处：《半导体技术》2012年第7期534-537,共4页Semiconductor Technology

摘　　要：设计了一个用于移动通信中继站的低相位噪声压控振荡器(VCO)。该VCO采用了考皮兹结构,谐振器使用LC器件,放大器件使用双极结型晶体管(BJT)。其频率调动范围为730～840 MHz,压控灵敏度为22 MHz/V,输出功率为10.7 dBm。在800 MHz中心频率处,其实测相位噪声分别为-99.42 dBc/Hz@10 kHz,-116.44 dBc/Hz@100 kHz,-135.06 dBc/Hz@1 MHz。提出了一种采用基极低频滤波的办法消除VCO的杂散频率,整个测试频段内观察不到明显的杂散。阐述了VCO相位噪声的主要来源,给出了低噪声VCO的设计方法。理论计算,仿真结果和实物测试取得了一致的结论,对低噪声VCO的设计提供了一定的参考。A low phase noise phase voltage controlled oscillator （VCO） for mobile communication repeater station was designed. Colpitts structure was adopted for the VCO, LC components was used as the resonator and BJT was used as the amplifier component. The frequency tuning range is from 730 MHz to 840 MHz with the output power of 10.7 dBm and the pressure control sensitivity of 22 MHz/V. At 800 MHz central frequency, the phase noise is -99.42 dffc/Hz at 10 kHz offset, - 116.44 dBc/Hz at 100 kHz offset and -135.06 dBc/Hz at 1 MHz offset separately. A low frequency filtering method at the base electrode was proposed to eliminate the spur, and no obvious spur was observed within the full test frequency band. The major phase noise source of the VCO was summarized, and the design method for the low noise VCO was given. The calculation result, simulation result and test result match well, which provides some references for the design of the low noise VCO.

关 键 词：压控振荡器 相位噪声 杂散 变容管 双极结型晶体管 

分 类 号：TN752[电子电信—电路与系统]