Fully-integrated wideband CMOS VCO with improved f – V linearity and low tuning sensitivity

A technique to improve the linearity of the frequency - voltage ( f-V) characteristic and to reduce the differential tuning sensitivity, K vco , of voltage-controlled oscillators (VCOs) is proposed. The VCO designed using the linearisation technique is tunable from 806 to 1113 MHz with a 34% tuning range and exhibits a nearly constant K vco of 62 MHz/V over the entire frequency range.