Abstract

This paper presents the design and analysis of a novel 2.4 GHz Voltage Controlled Oscillator (VCO), with amplitude control and Q enhancement circuit, for wireless communication applications. The variable capacitors and the inductors were designed using ANSYS and imported through DAC components in ADS (Advanced Design software). Accurate simulation of the VCO was performed in the software environments and the results are provided. To enhance the quality factor and to control the oscillation amplitude, additional CMOS circuits have been implemented. This VCO operates at 2.4 GHz, achieves a phase noise of -119dBc/Hz, 3MHz far from the carrier frequency. The VCO produces frequency tuning from 1.82 to 2.60 GHz (32.5%) with an ultra low power consumption of 73 µW. The output power level of the VCO is -9 dBm, with an improved predicted quality factor of 77.

Key words: Variable capacitor, nano inductor, voltage controlled oscillator, phase noise, Q enhancement.

Abbreviation

MWCNT, Multi walled carbon nano tube; VCO, voltage controlled oscillator; ADS, advanced design software.