JELE_V2_N1_RP4 Sreeja B.S. Radha S. Journal on Electronics Engineering 2249 – 0760 2 1 27 32 Variable Capacitor, Output Voltage Swing, Low Power Consumption, Ultra Low Supply Voltage, Quadrature Voltage Controlled Oscillator, Passive Coupling This paper presents the simulation analysis of a 2.4 GHz Quadrature Voltage Controlled Oscillator (QVCO), for low-power, low-voltage applications. Cross coupled LC VCO (Inductor-Capacitor Voltage Controlled Oscillator) topology is utilized to realize QVCO. With the passive coupling achieved from the MOS transistors, power consumption is minimized while maintaining a small chip area. The variable capacitors and the inductors are designed using ANSYS and imported through DAC components in ADS (Advanced Design software). Accurate simulation of the QVCO is performed in the software environments and the results are provided. This QVCO provides quadrature signals at 2.4 GHz, achieves a peak to peak voltage of 0.65 volts with a simulated low power consumption of 5.8 mA from a power supply voltage of 0.6 volts. The simulated QVCO produces frequency tuning from 2.1 GHz to 2.60 GHz (20.83%) with a control voltage varying from 0-0.3 volts. The output power level of the QVCO is -7 dBm, with an improved predicted quality factor of 60 and a phase noise of -134 dBc/Hz, 1MHz far from the carrier frequency. September - November 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1577