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A 4.2-5GHz,low phase noise LC-VCO with constant bandwidth and small tuning gain

徐琮辉  奚经天  卢磊  杨玉庆  谈煕  闫娜  闵昊  
【摘要】:As the tuning frequency of an integrated LC-voltage controlled oscillator (LC-VCO) increases,it is difficult to co-design the active negative resistance core and the varactor to achieve wideband frequency range,low phase noise,constant bandwidth and small tuning gain together.The presented VCO solves the problem by designing a set of changeable varactor units.The whole VCO was implemented in a 0.18μm CMOS process.The measured result shows-120 dBc/Hz phase noise at 1 MHz offset.The measured tuning range is from 4.2 to 5 GHz and the tuning gain is 8-10 MHz/V.The VCO draws 4 mA from a 1.5 V supply voltage.

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