LC RESONANCE VOLTAGE-CONTROLLED OSCILLATOR WITH ADJUSTABLE NEGATIVE RESISTANCE CELL FOR MULTI-BAND

摘要

An LC resonance voltage controlled oscillator for a multiband with an adaptive negative resistance cell is provided to prevent the deterioration of phase noise and to sufficiently compensate for variation of oscillation amplitude. An LC resonance voltage controlled oscillator(300) for a multiband with an adaptive negative resistance cell includes an inductance unit(330), a discrete capacitor bank, and a discrete negative resistance cell(310). The inductance unit provides an inductance component determining the frequency of an oscillating wave. The discrete capacitor bank determines the frequency of the oscillating wave, and provides a capacitance component discretely determined according to a control bit. The discrete negative resistance cell provides a negative resistance component discretely determined by the control bit so as to make amplitude of the oscillating wave uniform.