A　wide　tuning　range,　low　KVCO　and　low　phase　noise　VCO　is　presented　in　this　paper　by　combining　fully　differential　active　inductor　(DAI),　switched　capacitor　array　and　MOS-based　variable　capacitors.　The　adoption　of　the　DAI　instead　of　spiral　inductor　in　the　LC　tank　reduces　the　phase　noise　of　VCO　due　to　high　Q　value　of　DAI.　The　multiple　tuning　modes　by　tunable　active　inductor,　switched　capacitor　array　and　variable　capacitor　make　VCO　have　a　wide　tuning　range　of　oscillation　frequency　and　lower　KVCO.　Based　on　TSMC　0.18μm　CMOS　process,　the　VCO　is　verified　by　Advanced　Design　System　(ADS).　The　results　show　that　the　oscillation　frequency　can　be　tuned　from　988MHz　to　4601MHz　with　a　wide　tuning　bandwidth　of　129.3%,　and　the　lowest　phase　noise　is-116.88dBc/Hz　at　1MHz　offset,　and　the　KVCO　is　as　low　as　45-550MHz/V.　©　2018　IEEE.