A 22 GHz cascode CMOS VCO using frequency doubler

Abstract

This paper presents a fully integrated cascade CMOS LC VCO using frequency doubler for oscillating at 22 GHz bond. A symmetrical cascode coupling topology is implemented with negative conductance scheme for increasing the quality factor and output swing. Therefore, this architecture improves the phase noise characteristic in 0.18 mu m CMOS technology. In order to oscillate at 22 GHz band the frequency doubler (clipper) is used. The measured phase noise is -102.4 dBc/Hz at the I MHz offset frequency. The tuning range of 1.32 GHz is obtained with the control voltage from 0.5 to 1.6 V The current consumption of the VCO and the frequency doubler has 11.8 mA from 1.8 V supply. (c) 2007 Wiley Periodicals, Inc.