An ultra-wideband CMOS VCO with 3-5 GHz tuning range

Author

Wei, Chien-Cheng ; Chiu, Hsien-Chin ; Feng, Wu-Shiung

Author_Institution

Dept. of Electron. Eng., Chang Gung Univ., Taoyuan, Taiwan

fYear

2005

fDate

30 Nov.-2 Dec. 2005

Firstpage

87

Lastpage

90

Abstract

An ultra-wideband CMOS voltage-controlled oscillator (VCO) with 3-5 GHz tuning range is presented in this paper. The circuit was designed and fabricated by using TSMC 0.18-μm CMOS process. The proposed VCO is using the tunable active inductor to replace the passive spiral inductor. The active inductor can vary the inductance between 1.5∼7 nH with quality-factor > 30 by a feedback tunable resistor. Comparisons of this topology with conventional VCO show that this topology achieves better performance with very wide tuning range and compact chip size. The tuning range is approximately from 3 to 5 GHz for ultra-wideband system applications.

Keywords

CMOS integrated circuits; Q-factor; inductors; integrated circuit design; tuning; ultra wideband technology; voltage-controlled oscillators; 0.18 mum; 3 to 5 GHz; CMOS process; TSMC; passive spiral inductor; tunable active inductor; tuning; ultra-wideband CMOS VCO; ultra-wideband system; voltage-controlled oscillator; Active inductors; CMOS process; Circuit optimization; Feedback; Inductance; Spirals; Tunable circuits and devices; Tuning; Ultra wideband technology; Voltage-controlled oscillators; CMOS; active inductor; tuning range; ultra-wideband; voltage-controlled oscillator;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio-Frequency Integration Technology: Integrated Circuits for Wideband Communication and Wireless Sensor Networks, 2005. Proceedings. 2005 IEEE International Workshop on

Print_ISBN

0-7803-9372-4

Type

conf

DOI

10.1109/RFIT.2005.1598880

Filename

1598880