一种LC-VCO1/f^3相位噪声优化方法  

An Optimization Methodology of 1/f^3 Phase Noise for LC-VCO

作　　者：霍允杰 王海永[1] 陈岚[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《半导体技术》2015年第11期825-828,855,共5页Semiconductor Technology

基　　金：国家科技重大专项资助项目(2014ZX03001002-003)

摘　　要：建立了差分互补型电感电容压控振荡器(LC-VCO)的等效分析模型。采用有效截止频率fT,eff来表征MOS管的充放电能力,结合振荡器起振后共模输出电压下降的现象,提出了优化1/f3相位噪声的方法。采用该方法并结合跨导效率gm/ID设计方法,实现了LC-VCO 1/f3相位噪声的优化,并在0.18μm CMOS工艺上获得验证。结果表明,该优化方法可以使频偏在1 k Hz以内的相位噪声改善2~3 d B,可用于开环LC-VCO作为本振的低功耗无线收发机及高性能晶体振荡器的电路设计中。An equivalent analysis model of the differential complementary inductor-capacitor-tank voltage controlled oscillators（ LC-VCO） was established. The effective cutoff frequency fT,effwas used to characterize the charge-discharge capability of the metal-oxide-semiconductor（ MOS） transistor,and a novel 1/f3 phase noise optimization methodology was proposed considering the common-mode output vol tage of the start-up LC-VCO drops. The 1/f3 phase noise optimization flow of the LC-VCO was implemented by using the proposed methodology and the gm/ IDmethodology, and it was demonstrated in the0. 18μm CMOS process. The results show that 2-3 d B improvement of the phase noise within the 1 k Hz of the frequency offset is obtained by the proposed optimization methodology,which can be used to the low-power wireless transceivers using open-loop LC-VCO as local-oscillators and high-performance crystal oscillators.

关 键 词：相位噪声 低功耗 电感电容压控振荡器(LC-VCO) 跨导效率 有效截止频率 

分 类 号：TN702[电子电信—电路与系统] TN753.9