A wide-band low phase noise LC-tuned VCO with constant K_(VCO)/ω_(osc) for LTE PLL  

作　　者：Huang Jiwei Wang Zhigong Li Kuili Li Zhengping Wang Yongping 黄继伟;王志功;李奎利;李正平;王永平(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350002,China;Institute of RF&OE-IC,Southeast University,Nanjing 210096,China;Guangzhou Runxin Information Technology Ltd.Co.,Guangzhou 510663,China)

机构地区：[1]College of Physics and Information Engineering,Fuzhou University,Fuzhou 350002,China [2]Institute of RF&OE-IC,Southeast University,Nanjing 210096,China [3]Guangzhou Runxin Information Technology Ltd.Co.,Guangzhou 510663,China

出　　处：《Journal of Semiconductors》2012年第2期106-110,共5页半导体学报（英文版）

摘　　要：A wideband LC-tuned voltage-controlled oscillator（LC-VCO） applied in LTE PLL frequency synthesizers with constant AVco/ωosc is described.In order to minimize the loop bandwidth variations of PLL,a varactor array is proposed,which consists of a series of differential variable capacitor pairs and a series of single-pole double-throw（SPDT） switches to connect Vtune or Vdd.The switches are controlled by switching bits.With this scheme,the ratio of KV =（？）Cvar/（？）Vtune and the capacitance value of the capacitor array maintains relatively constant; furthermore,the loop bandwidth of the PLL fluctuation is suppressed.The 3.2—4.6-GHz VCO for multi-band LTE PLL is fabricated in a 0.13-μm RF-CMOS process.The VCO exhibits a maximum variation of AVCO/ωosc of only±4%.The VCO also exhibits a low phase-noise of-124 dBc/Hz at a 1-MHz offset frequency and a low current consumption of 18.0 mA with a 1.2-V power supply.A wideband LC-tuned voltage-controlled oscillator（LC-VCO） applied in LTE PLL frequency synthesizers with constant AVco/ωosc is described.In order to minimize the loop bandwidth variations of PLL,a varactor array is proposed,which consists of a series of differential variable capacitor pairs and a series of single-pole double-throw（SPDT） switches to connect Vtune or Vdd.The switches are controlled by switching bits.With this scheme,the ratio of KV =（？）Cvar/（？）Vtune and the capacitance value of the capacitor array maintains relatively constant; furthermore,the loop bandwidth of the PLL fluctuation is suppressed.The 3.2—4.6-GHz VCO for multi-band LTE PLL is fabricated in a 0.13-μm RF-CMOS process.The VCO exhibits a maximum variation of AVCO/ωosc of only±4%.The VCO also exhibits a low phase-noise of-124 dBc/Hz at a 1-MHz offset frequency and a low current consumption of 18.0 mA with a 1.2-V power supply.

关 键 词：voltage-controlled oscillator loop bandwidth LTE Kvco low phase noise 

分 类 号：TN752[电子电信—电路与系统] TN929.5