A Voltage Controlled Oscillator (VCO) is a critical building block in the design of current frequency synthesizers for RF system applications. State-of-the-art operation defines that an oscillator should have the best spectral purity while consuming low amount of power for a wide tuning range.With this in mind, this work presents a low phase noise wide tuning range Class-F VCO using a dual-mode resonator. In comparison to other conventional wideband oscillators, the proposed capacitively/inductively-coupled resonator will integrate the benefits of Class-F voltage control oscillators and dual-mode switching networks to obtain simultaneous low phase noise and wide-tuning range. The proposed structure, prototyped in 65nm TSMC CMOS technology, shows a 2.14 -4.22GHz continuous tuning range, phase noise figure-of-merit (FoM) of 192.7dB at 2.3GHz and better than 188dB across the entire operating frequency range. The oscillator consumes 15-16.4mW from a 0.6V supply and occupies an active area of 0.7mm 2 . In conclusion, the proposed resonator achieves 2-3dB phase noise improvement while achieving 65% overall tuning range when compared to a typical class-F VCO architecture. iii DEDICATION To Dad iv ACKNOWLEDGEMENTS Every successful thesis requires the constant help and support of others. Firstly, I would like to deeply thank Dr. Kamran Entesari, my research advisor, for giving me an opportunity to work in the Analog domain and guiding me throughout the endeavor. His valuable guidance, commitment and encouragement and his patience are the reason behind the successful completion of my thesis. Dabbagh Rezaei, each of whom, have helped me in various aspects of design, layout and testing. I am indebted to them and extremely grateful for their help and guidance.A special thanks to my parents and friends for all the inspiration, encouragement, support, love and sacrifice throughout all these years, without whom I wouldn't have been able to complete this work. v CONTRIBUTORS AND FUNDING SOURCESThis work was supervised by a thesis committee consisting of Dr. Kamran