Title :
A 1V CMOS quadrature LC VCO using diode coupling
Author :
Fu, Chan Tat ; Luong, Howard C.
Author_Institution :
Hong Kong Univ. of Sci. & Technol., Hong Kong
Abstract :
A new quadrature VCO is designed in a standard UMC 0.13 mu m CMOS process with low voltage, low power and low phase noise. Diodes are employed to generate second-harmonic coupling between the common sources of two LC VCOs for quadrature outputs. At 1-V supply and at 3.9 GHz, the QVCO measures phase noise of -117dBc/Hz at 1-MHz offset while dissipating 7.5 mA which corresponds to a figure of merit of 180 dBc. The core area is 0.37 mm2.
Keywords :
CMOS integrated circuits; coupled circuits; voltage-controlled oscillators; CMOS; current 7.5 mA; diode coupling; frequency 3.9 GHz; harmonic coupling; low phase noise; low power noise; low voltage noise; quadrature LC VCO; size 0.13 mum; voltage 1 V; voltage controlled oscillator; CMOS process; Coupling circuits; Design engineering; Diodes; Frequency conversion; Low voltage; Phase noise; Power engineering and energy; Power engineering computing; Voltage-controlled oscillators; Voltage controlled oscillators;
Conference_Titel :
Radio and Wireless Symposium, 2008 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-1462-8
Electronic_ISBN :
978-1-4244-1463-5
DOI :
10.1109/RWS.2008.4463455
