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 and Wang Yongping College of Physics and Information Engineering Fuzhou University Fuzhou China Institute of RF&OE IC Southeast University Nanjing China Guangzhou Runxin Information Technology Ltd Co Guangzhou China

来源：半导体学报, 2012, (02): 106-110.

• voltage-controlled oscillator
• loop bandwidth
• LTE
• KVCO
• low phase noise

<正>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.

• 出版日期2012-2-15
• 单位东南大学; 福州大学