A 4.3-GHz VCO with 2-GHz tuning range and low phase noise. - Paavo Väänänen; Mikko Metsänvirta; Nikolay T. Tchamov (IEEE J. Solid State Circuits, 2001)

VCO Design With On-Chip Calibration System. - Paavo Väänänen; Niko Mikkola; Petri Heliö (IEEE Trans. Circuits Syst. I Regul. Pap., 2006)