A technique for truly linear LC VCO tuning, a proof of concept
Based on the understanding of the relation between the shape of the LC VCO tuning curve and the varactor characteristics, a technique using an array of unequal varactors with different bias was found to obtain a truly linear tuning curve. An LC VCO was designed using TSMC 0.13?m 1.2V/3.3V IO process, the VCO frequency varies from 1.9 to 2.7ghz as its control voltage varies from 0 to 1.2V. The tuning gain was KVCO=630MHz/V 9.5%.
tuning curve varactor differential lc vco