a low - phase noise voltage control oscillator comprising a voltage source for supplying control voltage to the vco core ; a phase lock loop , having an output connected to an input of the voltage source ; a vco core , including an amplifier circuit with noiseless biasing and a tank circuit with noiseless biasing of the varactors ; having an output connected to an input of the phase lock loop ; and an attenuator , located between the voltage source and the vco core , for reducing phase noise from the voltage source to the vco core .