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This paper presents a novel variable inductor consisting of a triple transformer, pMOSFET switches and a level shift circuit in 0.13 μm CMOS technology. The structure of the variable inductor is designed and analyzed by using Ansoft HFSS. The inductance varies from 0.678 nH to 1.055 nH with changing a control voltage from 0 to 1.5 V. The quality factor of the variable inductor is around 7 at 3.4 GHz.
A novel resonant circuit consisting of transformer-based variable inductors and MOS varactors is proposed to implement an ultra-wideband voltage-controlled-oscillator (VCO). The VCO is designed and fabricated using 0.13 mum CMOS, and fully evaluated on wafer. The VCO IC exhibits a frequency tuning range as high as 92.6 % spanning from 1.2 GHz to 3.27 GHz. The measured phase noise of -120 dBc/Hz at...
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