Title :
Graphical method for the optimization of CMOS quadrature VCO
Author :
Dorra, Me Ilou Ii ; Hassene, Mnif ; Loulou, Mourad
Author_Institution :
Res. Unit on Electron. & Inf. Technol., Nat. Eng. Sch. of Sfax (ENIS), Sfax, Tunisia
Abstract :
This paper describes a graphical method for the optimization of Quadrature Voltage Controlled Oscillators (QVCOs) based on the coupling of two LC-tank VCO. A three-dimensional phase noise analysis diagram and graphical optimization approach is presented, to optimize QVCO phase noise while satisfying design constraints such as power dissipation, tank amplitude, tuning range and start up condition. The obtained QVCO can be tuned between 2.2GHz and 2.58GHz, and shows a phase noise of -129 dBc/Hz at 1MHz offset from a 2.4 GHz carrier, for a current consumption of 9.25mW. The equivalent phase error and amplitude error between I and Q signals are respectively 0.65° and 1.87%.
Keywords :
CMOS integrated circuits; UHF oscillators; optimisation; phase noise; voltage-controlled oscillators; CMOS quadrature VCO; LC-tank VCO; amplitude error; frequency 2.2 GHz to 2.58 GHz; graphical method; optimization; phase error; power 9.25 mW; power dissipation; tank amplitude; three-dimensional phase noise analysis diagram; tuning range; voltage controlled oscillators; Analytical models; CMOS integrated circuits; CMOS technology; Metals; Noise; Semiconductor device modeling; Software; Optimisation; graphical; phase noise; quadrature VCO;
Conference_Titel :
Symbolic and Numerical Methods, Modeling and Applications to Circuit Design (SM2ACD), 2010 XIth International Workshop on
Conference_Location :
Gammath
Print_ISBN :
978-1-4244-6816-4
DOI :
10.1109/SM2ACD.2010.5672355
