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...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.展开更多
A wideband low-phase-noise LC voltage-controlled oscillator （VCO） with low VCO gain （Kvco） vari- ation for WLAN fractional-N frequency synthesizer application is proposed and designed on a 0.13-μm CMOS process. I...A wideband low-phase-noise LC voltage-controlled oscillator （VCO） with low VCO gain （Kvco） vari- ation for WLAN fractional-N frequency synthesizer application is proposed and designed on a 0.13-μm CMOS process. In order to achieve a low Kvco variation, an extra switched varactor array was added to the LC tank with the conventional switched capacitor array. Based on the proposed switched varactor array compensation technique, the measured Kvco is 43 MHz/V with only 6.29% variation across the entire tuning range. The proposed VCO provides a tuning range of 23.7% from 3.01 to 3.82 GHz, while consuming 9 mA of quiescent current from a 2.3 V supply. The VCO shows a low phase noise of-121.94 dBc/Hz at 1 MHz offset, from the 3.6 GHz carrier.展开更多
文摘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.
基金supported by the State Key Development Program for Basic Research of China(No.2010CB327404)the National High Technology Research and Development Program of China(No.2011AA010202)+2 种基金the National Science and Technology Major Project of China(No.2012ZX03004004)the National Natural Science Foundation of China(Nos.61176034,61101001,61204026)the Tsinghua University Initiative Scientific Research Program
文摘A wideband low-phase-noise LC voltage-controlled oscillator （VCO） with low VCO gain （Kvco） vari- ation for WLAN fractional-N frequency synthesizer application is proposed and designed on a 0.13-μm CMOS process. In order to achieve a low Kvco variation, an extra switched varactor array was added to the LC tank with the conventional switched capacitor array. Based on the proposed switched varactor array compensation technique, the measured Kvco is 43 MHz/V with only 6.29% variation across the entire tuning range. The proposed VCO provides a tuning range of 23.7% from 3.01 to 3.82 GHz, while consuming 9 mA of quiescent current from a 2.3 V supply. The VCO shows a low phase noise of-121.94 dBc/Hz at 1 MHz offset, from the 3.6 GHz carrier.
