A 4.8-6.8GHz low phase noise LC VCO in 0.13-mu m CMOS technology

摘要

This letter presents a novel LC voltage controlled oscillator (VCO) supporting the high-speed serial transmission standard of RapidIO in 0.13-mu m complementary metal-oxide semiconductor technology. The low phase noise is achieved through several techniques including current source switching, parallel coupled negative transconductance cell, and varactor bias combination scheme. Measured results of proposed circuit show a low phase noise of -120 dBc/Hz at 1MHz offset from 6.25 GHz carrier and tuning range of 4.8 similar to 6.8 GHz (34.48%) while consuming 7.4mW under the supply voltage of 1.2V. Copyright (C) 2015 John Wiley & Sons, Ltd.