基于恒定漏-源电压的LC-Tank幅度控制方法  

Controlling LC-Tank amplitudes based on constant drain-source voltages

作　　者：王德志[1] 张科峰[1] 石琴琴[1] 邹雪城[1] 

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2013年第2期48-52,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家科技重大专项资助项目(2010ZX03007-002-02)

摘　　要：运用电压受限区和电流受限区的原理,提出了一种用于宽带LC-VCOs中基于恒定漏-源电压的LC-Tank幅度控制方法.通过检测交叉耦合管漏-源电压的变化值选择不同的尾偏置电压,避免LC-VCOs在高频处工作在电压受限区,达到优化相位噪声和功耗的目的.该方法应用于谐振频率为1.52～3.20GHz的LC-VCO,在3.2GHz载波处,10kHz和600kHz频偏的相位噪声为-77.0dBc/Hz和-118.4dBc/Hz,较没有幅度控制的情形分别改进了8.0dB和1.4dB,且在整个频段内的最大功耗为8.6mW.According to the principle of voltage-limited and current-limited regimes, an amplitude control for wideband LC-VCOs （inductor capacitor voltgage-controlled oscillators） based on constant drain-source voltages was proposed, whose idea was to adjust the tail biasing voltage based on the drain-source voltage variations, in order to avoid the wideband LC-VCO working in voltage-limited regime and improve the phase noise and save the power. When the proposed amplitude control was used for a LC-VCO with tuning frequency from 1.52 GHz to 3.20 GHz, the phase noise were -77.0 dBc/ Hz and -118.4 dBc/Hz at frequency offsets of 10 kHz and 600 kHz from a carrier frequency of 3.2 GHz, which are 8 dB and 1.4 dB lower than that of LC-VCO without amplitude control. Besides, the maximum power consumption of this LC-VCO is 8.6 mW.

关 键 词：宽带压控振荡器 幅度控制 恒定漏-源电压 低相位噪声 低功耗 

分 类 号：TN752[电子电信—电路与系统] TN765.5