Title :
A 0.8-V CMOS quadrature LC VCO using capacitive coupling
Author :
Fu, Chan Tat ; Luong, Howard C.
Author_Institution :
Hong Kong Univ. of Sci. & Technol., Hong Kong
Abstract :
A new concept for quadrature coupling of LC oscillators is introduced and demonstrated in a 4.5-GHz CMOS quadrature voltage-controlled oscillator (QVCO). By employing cupacitivc coupling of second harmonic components, quadrature outputs can be obtained at a low supply voltage without extra power consumption. Fabricated in a 0.13 mum CMOS process and operated at 0.8-V supply, the proposed QVCO measures phase noise of-112dBc/Hz at 1M offset from -1.91GHz while drawing a total current of 4mA, which corresponds to a FOM of 181 dB. The core area is 0.278mm2.
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; voltage-controlled oscillators; CMOS quadrature LC VCO; LC oscillator; capacitive coupling; current 4 mA; frequency 4.5 GHz; quadrature coupling; second harmonic component; size 0.13 mum; voltage 0.8 V; CMOS technology; Capacitors; Coupling circuits; Energy consumption; Frequency conversion; Low voltage; Phase noise; Power system harmonics; Solid state circuits; Voltage-controlled oscillators;
Conference_Titel :
Solid-State Circuits Conference, 2007. ASSCC '07. IEEE Asian
Conference_Location :
Jeju
Print_ISBN :
978-1-4244-1359-1
Electronic_ISBN :
978-1-4244-1360-7
DOI :
10.1109/ASSCC.2007.4425724
