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

fYear

2001

fDate

2001

Firstpage

201

Lastpage

204

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits, 2001, IEEE Conference on.

Conference_Location

San Diego, CA

Print_ISBN

0-7803-6591-7

Type

conf

DOI

10.1109/CICC.2001.929755

Filename

929755