Patent ID: 7755440

Claim:
A voltage controlled oscillator (VCO) comprising: a VCO unit comprising a plurality of VCO unit output terminals, the VCO unit generating a plurality of first output signals having an oscillation frequency corresponding to a supply voltage; and an amplifier comprising a plurality of amplifier output terminals respectively connected to the plurality of VCO unit output terminals, the amplifier amplifying a value obtained by performing n-th differentiation on a transconductance component of each first output signal (n being a natural number) by adjusting a bias voltage applied to the amplifier, wherein a plurality of second output signals, corresponding to the plurality of first output signals, are output through the plurality of amplifier output terminals, each second output signal comprising the amplified value of the corresponding first output signal, and wherein the bias voltage comprises a voltage at which the plurality of first output signals intersect with each other, the plurality of first output signals having first predetermined slopes.