Title :
Current reused LC VCOs
Author :
Nam-Jin Oh ; Sang-Gug Lee
Author_Institution :
Dept. of Eng., Inf. & Commun. Univ., Daejeon, South Korea
Abstract :
This paper presents current reused voltage controlled oscillator (VCO) topologies by stacking switching transistors in series like a cascode. The VCOs can operate with only half the amount of dc current compared to those of the conventional VCO topologies. Fabricated in 0.18-μm CMOS process, a differential VCO operates in a 2.1-GHz band with a phase noise of -110dBc/Hz at 1-MHz offset, and a quadrature VCO operates in a 3.1-GHz band with a phase noise of -102dBc/Hz at 1-MHz offset. The proposed topologies can be adopted for low-power applications.
Keywords :
CMOS integrated circuits; low-power electronics; microwave oscillators; phase noise; voltage-controlled oscillators; 0.18 micron; 1 MHz; 2.1 GHz; 3.1 GHz; CMOS process; current reused LC VCO; differential voltage controlled oscillator; phase noise; quadrature voltage controlled oscillator; switching transistor; CMOS technology; Circuit topology; Energy consumption; Frequency conversion; Inductors; Radiofrequency integrated circuits; Signal generators; Transceivers; Varactors; Voltage-controlled oscillators; CMOS; differential voltage controlled oscillator (VCO); phase noise; quadrature VCO (QVCO); radio-frequency (RF);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.858993
