Title :
2.4 GHz / 3.5 GHz dual-band wide-tuning-range quadrature VCO using harmonic-injection coupling technique
Author :
Muh-Dey Wei ; Sheng-Fuh Chang ; Ye Zhang ; Yung-Jhih Yang ; Negra, Renato
Author_Institution :
UMIC Res. Centre, RWTH Aachen Univ., Aachen, Germany
Abstract :
In this paper, a dual-band wide-tuning-range quadrature VCO (QVCO) using a harmonic-injection coupling technique is proposed. The tuning range of a switched-capacitor and a switched-inductor LC-tank are investigated. Based on the investigation, a switched-inductor tank is employed since it provides a wide tuning range. A harmonic-injection coupling technique, which eliminates the noise sources of coupling transistors, is applied to generate the quadrature outputs. The QVCO is designed for 3.5GHz WiMAX and 2.4 GHz ISM applications. A tuning range of 24.9% and 20.7% are obtained. The measured phase noise is -123.5 dBc/Hz and -125.9 dBc/Hz at a 1MHz offset, respectively. Significant FOMT of -191.7 and -192.4 are achieved.
Keywords :
UHF oscillators; WiMax; inductors; microwave oscillators; phase noise; switched capacitor networks; voltage-controlled oscillators; ISM applications; LC-tank; WiMAX; coupling transistors; dual-band VCO; frequency 2.4 GHz; frequency 3.5 GHz; harmonic-injection coupling technique; noise source elimination; phase noise; switched capacitor tank; switched-inductor tank; voltage controlled oscillator; wide-tuning-range quadrature VCO; CMOS integrated circuits; Couplings; Dual band; Inductors; Switches; Tuning; Voltage-controlled oscillators; Harmonic injection; Quadrature voltage controlled oscillator (QVCO); Switched inductor; Wide tuning range;
Conference_Titel :
Silicon Monolithic Integrated Circuits in Rf Systems (SiRF), 2014 IEEE 14th Topical Meeting on
Conference_Location :
Newport Beach, CA
DOI :
10.1109/SiRF.2014.6828510
