Title :
Wide tuning range CMOS quadrature ring oscillator of best figure of merit
Author :
Pokharel, Ramesh K. ; Nizhnik, Oleg ; Tomar, A. ; Lingala, S. ; Kanaya, Haruichi ; Yoshida, Keiji
Author_Institution :
Grad. Sch. of lSEE, Kyushu Univ. Nishi-ku, Fukuoka, Japan
Abstract :
This paper presents a low phase noise quadrature ring oscillator with new start-up circuit. The oscillator architecture is two-stage differential ring with additional pair of transition-assistance inverters. The circuit was implemented in 0.18 mum CMOS technology and the measured tuning range of the prototype device is from 1.7 GHz to 5.5 GHz and figure of merit (FOM) is -162 dB. The proposed area of application is the core of the local oscillator in a multi-standard wireless transceiver.
Keywords :
CMOS integrated circuits; MMIC oscillators; UHF oscillators; circuit tuning; field effect MMIC; invertors; phase noise; transceivers; CMOS quadrature ring oscillator; frequency 1.7 GHz to 5.5 GHz; local oscillator; low phase noise oscillator; multistandard wireless transceiver; size 0.18 mum; start-up circuit; transition-assistance inverter; two-stage differential ring; CMOS technology; Circuits; Frequency; Inverters; MOSFETs; Phase noise; Ring oscillators; Tail; Tuning; Voltage;
Conference_Titel :
Microwave Integrated Circuits Conference, 2009. EuMIC 2009. European
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4749-7
