paper presents the design and analysis of a 2.4 GHz Voltage Controlled Oscillator (VCO), with high output voltage swing for wireless communication applications. The oscillation frequency and the start-up conditions are derived. Accurate simulation of the VCO is performed in the software environments and the results are provided. A good agreement is seen between the simulation results and the derivation. This VCO operates at 2.4 GHz, achieves a peak to peak voltage of 0.758 volts with a low power consumption of 0.461 mA from a power supply voltage of 0.6 volts. The simulated VCO produces frequency tuning from 1,82GHz to 2.60 GHz (32.5%) with a control voltage varying from 0-0.3 volts. The output power level of the VCO is -8 dBm, with an improved predicted quality factor of 60.

Keywords: Variable capacitor, high output voltage swing, low power consumption, ultra low supply voltage