A wideband LC tank voltage-controlled-oscillator（VCO） is proposed.To solve the impacts of wideband operation on VCO gain（K_（VCO）） variation and start-up constraint,a binary-weighted varactor array and a binary-w...A wideband LC tank voltage-controlled-oscillator（VCO） is proposed.To solve the impacts of wideband operation on VCO gain（K_（VCO）） variation and start-up constraint,a binary-weighted varactor array and a binary-weighted negative resistance array all with optimal unit values are designed.Implemented in a 0.18μm CMOS process,the proposed VCO shows a frequency tuning range from 1.9 to 3.1 GHz,with a current consumption varying accordingly from 14.2 to 4 mA from a 1.8 V supply.With the proposed K_（VCO） suppression technique,the K_（VCO） varies from 50 to 60 MHz/V in the entire frequency range.The measured phase noise is -117 dBc/Hz at a 1 MHz offset from a 3 GHz carrier.展开更多
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...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。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
采用SMIC 0.18μm Mixed Signal CMOS工艺设计了恒定压控增益的宽带LC压控振荡器。采用模拟式振幅负反馈的方式,通过模拟电路实现对偏置电流的负反馈控制,同时采用了通过数字控制的单刀双掷开关控制可变电容阵列的调谐,并且对固定电容...采用SMIC 0.18μm Mixed Signal CMOS工艺设计了恒定压控增益的宽带LC压控振荡器。采用模拟式振幅负反馈的方式,通过模拟电路实现对偏置电流的负反馈控制,同时采用了通过数字控制的单刀双掷开关控制可变电容阵列的调谐,并且对固定电容单元进行开关的方法,从而实现恒定的压控增益且相邻频带之间的频率间隔近似相等。后仿真结果表明,本设计的LC VCO调谐频率范围2.15~3.03 GHz,压控增益在全部频率调谐范围内为70~80 MHz/V,相位噪声在全部频率调谐范围内低于-120.0 d Bc/Hz@1 MHz。展开更多
基金supported by the State Key Development Program for Basic Research of China(No.2010CB327404)
文摘A wideband LC tank voltage-controlled-oscillator（VCO） is proposed.To solve the impacts of wideband operation on VCO gain（K_（VCO）） variation and start-up constraint,a binary-weighted varactor array and a binary-weighted negative resistance array all with optimal unit values are designed.Implemented in a 0.18μm CMOS process,the proposed VCO shows a frequency tuning range from 1.9 to 3.1 GHz,with a current consumption varying accordingly from 14.2 to 4 mA from a 1.8 V supply.With the proposed K_（VCO） suppression technique,the K_（VCO） varies from 50 to 60 MHz/V in the entire frequency range.The measured phase noise is -117 dBc/Hz at a 1 MHz offset from a 3 GHz carrier.
文摘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。
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.
