Title :
A -94 dBc/Hz@100 kHz, fully-integrated, 5-GHz, CMOS VCO with 18% tuning range for Bluetooth applications
Author :
Samori, C. ; Levantino, S. ; Boccuzzi, V.
Author_Institution :
Agere Syst., Lucent Technol., Murray HIll, NJ, USA
Abstract :
A 5-GHz, fully monolithic voltage-controlled oscillator (VCO) for Bluetooth wireless transceivers is demonstrated in a 0.25 μm CMOS technology using accumulation mode varactors and spiral inductors. An 18% tuning range was measured for only 2.5 V tuning-voltage variation. The phase noise was -94 dBc/Hz at 100 kHz frequency offset with 40 kHz 1/f3 corner frequency. These low values are limited by the up-conversion of flicker noise due to varactor amplitude-to-frequency conversion and to the modulation of the varactor bias point. This explanation is verified by simulations and measurements. The circuit draws 5.5 mA from a 2.5 V power supply
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; circuit tuning; field effect MMIC; flicker noise; inductors; integrated circuit noise; transceivers; varactors; voltage-controlled oscillators; wireless LAN; 0.25 micron; 2.5 V; 5 GHz; 5.5 mA; Bluetooth applications; CMOS VCO; CMOS technology; accumulation mode varactors; corner frequency; flicker noise; frequency offset; spiral inductors; tuning range; tuning-voltage variation; up-conversion; varactor amplitude-to-frequency conversion; varactor bias point; wireless transceivers; Bluetooth; CMOS technology; Frequency; Inductors; Phase noise; Spirals; Transceivers; Tuning; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Custom Integrated Circuits, 2001, IEEE Conference on.
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-6591-7
DOI :
10.1109/CICC.2001.929755
