Abstract

A 4.8GHz low-noise quadrature Colpitts VCO is presented. Use of the current switching differential Colpitts configuration together with super harmonic coupling scheme for quadrature signal generation ensures low phase noise operation. The advantage of proposed differential VCO is analyzed in terms of power consumption, phase noise, and figure of merit. The QVCO has been fabricated with the 0.18-m TSMC CMOS technology for 4.8GHz band operation and the obtained phase noise is -120 dBc/Hz at 1MHz offset frequency while 7mA current consumption and 12.6mW power consumption from 1.8V power supply

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