A Low-Noise Multi-GHz CMOS Multiloop Ring Oscillator With Coarse and Fine Frequency Tuning

Author

Liu, Hai Qi ; Goh, Wang Ling ; Siek, Liter ; Lim, Wei Meng ; Zhang, Yue Ping

Author_Institution

Inst. of Microelectron., Singapore

Volume

17

Issue

4

fYear

2009

fDate

4/1/2009 12:00:00 AM

Firstpage

571

Lastpage

577

Abstract

A 7-GHz CMOS voltage controlled ring oscillator that employs multiloop technique for frequency boosting is presented in this paper. The circuit permits lower tuning gain through the use of coarse/fine frequency control. The lower tuning gain also translates into a lower sensitivity to the voltage at the control lines. Fabricated in a standard 0.13-mum CMOS process, the proposed voltage-controlled ring oscillator exhibits a low phase noise of -103.4 dBc/Hz at 1 MHz offset from the center frequency of 7.64 GHz, while consuming a current of 40 mA excluding the buffer.

Keywords

CMOS integrated circuits; MMIC oscillators; circuit tuning; field effect MMIC; integrated circuit noise; phase noise; voltage-controlled oscillators; coarse frequency tuning; fine frequency tuning; frequency 7 GHz; frequency boosting; low-noise multiGHz CMOS multiloop ring oscillator; phase noise; size 0.13 mum; tuning gain; voltage-controlled ring oscillator; CMOS; coarse/fine tuning; gigahertz (GHz); multiloop; phase noise; ring oscillator; voltage-controlled oscillator (VCO);

fLanguage

English

Journal_Title

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on

Publisher

ieee

ISSN

1063-8210

Type

jour

DOI

10.1109/TVLSI.2008.2011206

Filename

4768630