This paper presents a new technique for tuning the oscillation frequency of the VCO. The proposed VCO technique accomplishes wide tuning by utilizing a quantum dot transistor as a tuneable capacitor. The capacitance of the quantum dot transistor is changed by controlling the quantum dot charges that lead to vary the threshold voltage. The results show that a wide oscillation frequency range is achieved. The oscillation frequency is tuned from 19.13 GHz to 27.18 GHz, tuning of 42%, as the quantum dot transistor threshold voltage shift varies by 0.7 V.

VCO, quantum dot transistor, threshold voltage, capacitance voltage characteristic, quantum dot charge.