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A novel transformer-type variable inductor is proposed to achieve a wide tuning range at frequencies as high as K band.The variable inductor is designed,and an intuitive model is built to analyze its performance by HFSS.A lot of mathematical analysis is done in detail.A VCO using the proposed variable inductor is designed with TSMC 0.13 m CMOS technology for verification.The frequency tuning range of the VCO depends on the proposed variable inductor.The phase noise of the VCO depends on the quality of the LC tank(including the proposed variable inductor and varactors).So a specific AMOS varactor is implemented to improve its quality factor.The VCO is simulated at three typical TSMC fabrication corners(TT,FF,SS) to predict its measure results.The post simulation results shows that the VCO achieves a 20–25.5 GHz continuous tuning range.Its phase noise results at 1 MHz offset are –108.4 dBc/Hz and –100.5 dBc/Hz respectively at the tuning frequencies of 19.6 GHz and 25.5 GHz.The VCO draws only 3 to 6 mA from a 1.2 V power supply.
A novel transformer-type variable inductor is proposed to achieve a wide tuning range at frequencies as high as K band. The variable inductor is designed, and an intuitive model is built to analyze its performance by HFSS. A lot of mathematical analysis is done in detail.A VCO using the proposed variable inductor is designed with TSMC 0.13 m CMOS technology for verification. The frequency tuning range of the VCO depends on the proposed variable inductor. the phase noise of the VCO depends on the quality of the LC tank (including the proposed variable inductor and varactors) .So a specific AMOS varactor is implemented to improve its quality factor. The VCO is simulated at three typical TSMC fabrication corners (TT, FF, SS) to predict its measure results. The post simulation results shows that the VCO achieves a 20-25.5 GHz continuous tuning range. Its phase noise results at 1 MHz offset are -108.4 dBc / Hz and -100.5 dBc / Hz respectively at the tuning frequencies of 19.6 GHz and 25.5 GHz.The VCO draws only 3 to 6 mA from a 1.2 V power supply.